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			firasans
		
	
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| 52c76c4f97 | |||
| b3ae4ccec4 | |||
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| cb6b15150b | |||
| b316960980 | |||
| 14ab89e748 | 
							
								
								
									
										5
									
								
								.latexmkrc
									
									
									
									
									
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										5
									
								
								.latexmkrc
									
									
									
									
									
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							@@ -0,0 +1,5 @@
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$pdf_mode = 1;              # 生成PDF
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$latex = 'xelatex %O %S';   # 用 xelatex 替代 latex
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$pdflatex = 'xelatex %O %S'; # 用 xelatex 替代 pdflatex
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$dvi_mode = 0;              # 禁用DVI输出
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$postscript_mode = 0;       # 禁用PS输出
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@@ -1,13 +1,32 @@
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% Copyright 2018 by Zhibo Wang
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%
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% This file may be distributed and/or modified
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% under the LaTeX Project Public License
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\usepackage[sfdefault]{FiraSans}
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% !TEX program = xelatex
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% !TEX TS-program = xelatex
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% fonts
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\RequirePackage{fontspec}
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% \usefonttheme{professionalfonts}
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% \RequirePackage[sfdefault]{FiraSans}
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\RequirePackage{FiraMono} 
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\renewcommand{\rmfamily}{\sffamily}
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% \RequirePackage[fakebold]{firamath-otf}
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\RequirePackage{unicode-math}
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\RequirePackage{amsmath}
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\RequirePackage{amsthm}
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\RequirePackage{amssymb}
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\RequirePackage{inputenc}
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\unimathsetup{math-style=ISO, bold-style=ISO, mathrm=sym}
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\setsansfont{FiraGO}[BoldFont=* SemiBold, Numbers=Monospaced]
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\setmathfont{Fira Math}[BoldFont=*-SemiBold]
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% \setmathfont[range=bb]{XITS Math Bold}
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\RequirePackage{xeCJK}
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\setCJKmainfont{Source Han Sans SC}
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\setCJKsansfont{Source Han Sans SC}
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\setCJKmonofont{Source Han Sans SC}
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\RequirePackage[english]{babel}
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\RequirePackage{fancyhdr}        % header footer
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\RequirePackage{xcolor}
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\RequirePackage[dvipsnames]{xcolor}
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\RequirePackage{bookmark}
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\RequirePackage{hyperref}[colorlinks=true,urlcolor=Blue,citecolor=Green,linkcolor=BrickRed,unicode]
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\RequirePackage{natbib}
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\RequirePackage{graphicx} % Allows including images
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\RequirePackage{booktabs} % Allows the use of \toprule, \midrule and \bottomrule in tables
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% \RequirePackage{tikz}
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@@ -18,11 +37,8 @@
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% \RequirePackage[ruled,linesnumbered]{algorithm2e}
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% \RequirePackage{adjustbox}
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\RequirePackage{subcaption}
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\RequirePackage{amsmath}
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\RequirePackage{amsthm}
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\RequirePackage[utf8]{inputenc}
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\RequirePackage{CJKutf8}
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\def\zh#1{\begin{CJK}{UTF8}{gbsn}#1\end{CJK}}
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% \RequirePackage{CJKutf8}
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% \def\zh#1{\begin{CJK}{UTF8}{gbsn}#1\end{CJK}}
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\RequirePackage{aliascnt}
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% a color box
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@@ -125,12 +141,12 @@
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\setbeamercolor{alerted text}{fg=beamer@simple@color}
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\setbeamerfont{block title alerted}{series=\mdseries}
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\setbeamerfont{alerted text}{series=\bfseries\boldmath}
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\hypersetup{colorlinks,linkcolor=,urlcolor=oliver}
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\hypersetup{colorlinks=true,linkcolor=,citecolor=Green,urlcolor=oliver}
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% \usefonttheme[onlymath]{serif}
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\setbeamerfont{frametitle}{series=\bfseries\boldmath}
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\setbeamerfont{block title}{series=\bfseries\boldmath}
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\setbeamerfont{title}{series=\bfseries\boldmath}
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\setbeamertemplate{frametitle}{\vskip2pt\hskip-6pt\underline{\insertframetitle}} % add line under frametitle
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\setbeamertemplate{frametitle}{\vskip2pt\hskip-6pt\underbar{\insertframetitle}} % add line under frametitle
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% theorem env
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\setbeamertemplate{theorem begin}{%
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@@ -159,8 +175,9 @@
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}
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% more theorem env
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\newtheorem{observation}{Observation}
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\newtheorem{question}{Question}
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\newtheorem{conjecture}[theorem]{Conjecture}
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\newtheorem{observation}[theorem]{Observation}
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\newtheorem{question}[theorem]{Question}
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% ----------------------------------------------------------------------
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@@ -173,13 +190,13 @@
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%  I give up.  These are in the wrong font, but my kludged versions 
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%  LOOK like kludges, especially \Z, \Q, and \C.
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%
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\def\Real{\mathbb{R}}
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\def\Proj{\mathbb{P}}
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\def\Hyper{\mathbb{H}}
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\def\Integer{\mathbb{Z}}
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\def\Natural{\mathbb{N}}
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\def\Complex{\mathbb{C}}
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\def\Rational{\mathbb{Q}}
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\def\Real{ℝ}
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\def\Proj{ℙ}
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\def\Hyper{ℍ}
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\def\Integer{ℤ}
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\def\Natural{ℕ}
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\def\Complex{ℂ}
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\def\Rational{ℚ}
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\let\N\Natural
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\let\Q\Rational
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										29
									
								
								main.tex
									
									
									
									
									
								
							
							
						
						
									
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								main.tex
									
									
									
									
									
								
							@@ -1,8 +1,8 @@
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\documentclass{beamer}
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\title[template example]{Minimizing the Sum of Piecewise Linear Convex Functions}
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\title[template example]{Title}
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\date{\today}
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\author{\texorpdfstring{\zh{丛宇}}{Yu Cong}}
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\author{丛宇}
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% \AtBeginSection[]{
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%     \frame{\frametitle{Outline}\tableofcontents[currentsection, 
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%     subsectionstyle=show/show/shaded]}
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@@ -23,6 +23,7 @@
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\section{Problems \& Definitions}
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\begin{frame}{$\min \sum f_i(a_i\cdot x-b_i)$}
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    $A\setminus B$ 测试中文:
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\begin{problem}
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    Given $n$ piecewise linear convex functions $f_1,...,f_n:\R \to \R$ of total $m$ breakpoints, and $n$ linear functions $a_i\cdot x-b_i:\R^d\to \R$, find $\min_x \sum_i f_i(a_i\cdot x-b_i)$.
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\end{problem}
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@@ -78,7 +79,7 @@ However, observe that in our problem the piecewise linear convex function is not
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    Let $n_i$ be the number of line segments in $f_i$. Note that $\sum_i n_i=m+n$.
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    We can formulate the optimization problem as the following linear program,
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    \newpage
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    \framebreak
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    \begin{align*}
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        \min &\sum_{i=1}^n f_i\\
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@@ -92,10 +93,8 @@ However, observe that in our problem the piecewise linear convex function is not
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\section{LP in Low Dimensions}
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\begin{frame}[allowframebreaks]{Megiddo's algorithm}%
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    \boxfill{
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        \tiny
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        \url{https://people.inf.ethz.ch/gaertner/subdir/texts/own_work/chap50-fin.pdf}
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    }
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    \url{https://people.inf.ethz.ch/gaertner/subdir/texts/own_work/chap50-fin.pdf}
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    The dimension $d$ (in our problem, the dimension of $x$) is small while the number of constraints are huge. We need only $d$ linearly independent tight constraints to identify the optimal solution $x^*$.
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    Thus most of the constraints are useless.
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@@ -106,7 +105,7 @@ However, observe that in our problem the piecewise linear convex function is not
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    Through inquiries. Let $a\cdot x \leq b$ be the constraint. Define 3 hyperplanes, $a\cdot x = c$ where $c\in \set{b,b-\e,b+\e}$. Now solve three $d-1$ dimension linear programming. The largest of the three objective functions tells us where $x^*$ lies with respect to the
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    hyperplane.
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    \newpage
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    \framebreak
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    Finding the optimal solution $x^*$ is therefore equivalent to the following problem,
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    \begin{problem}[Multidimensional Search Problem]
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        Suppose that there exists a point $x^*$ which is not known to us, but there is a oracle that can tell the position of $x^*$ relative to any hyperplane in $\R^d$. Given $n$ hyperplanes, we want to know the position of $x^*$ relative to each of them.
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@@ -114,7 +113,7 @@ However, observe that in our problem the piecewise linear convex function is not
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    \textbf{What about 1 dimension search?} A fastest way will be using the linear time median algorithm. We can find the median of $n$ numbers and call the oracle to compare the median with $x^*$. Thus with $O(n)$ time median finding and one oracle call, we find the relative position of $n/2$ elements relative to $x^*$.
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    \newpage
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    \framebreak
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    If we can do similar things in $\R^d$, i.e., there is a method which makes $A(d)$ oracle calls and determines at least $B(d)$ fraction of relative positions, then we can apply this method $\log_{\frac{1}{1-B(d)}} n$ times to find all relative positions.
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@@ -124,7 +123,7 @@ However, observe that in our problem the piecewise linear convex function is not
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    \[T(n,d)=n(3T(n-1,d-1)+O(nd))\] 
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    Note that in this setting $A(d)=1$ and $B(d)=1/n$.
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    \newpage
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    \framebreak
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    Megiddo designed a clever method where $A(d)=2^{d-1}$ and $B(d)=2^{-(2^d-1)}$.
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    \begin{lemma}
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@@ -133,7 +132,7 @@ However, observe that in our problem the piecewise linear convex function is not
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        \end{figure}
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        Given two lines through the origin with slopes of opposite sign, knowing which quadrant $x^*$ lies in allows us to locate it with respect to at least one of the lines.
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    \end{lemma}
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    \newpage
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    \framebreak
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    Let $l_H$ be the intersection of hyperplane $H$ and $x_1x_2$ plane.
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    Compute a partition $S_1\sqcup S_2=\mathcal H$. 
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    $H\in S_1$ iff $l_H$ has positive slope. Otherwise $l_H\in S_2$. We further assume that $|S_1|=|S_2|=n/2$.
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@@ -148,12 +147,8 @@ However, observe that in our problem the piecewise linear convex function is not
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        Now we have $n/2$ pairs $(H_1,H_2)$, where $H_i\in S_i$. Let $l_i$ be the intersection of $H_i$ and $x_1x_2$ plane.
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        Let $H_{x_i}$ be the linear combination of $H_1$ and $H_2$ s.t. $x_i$ is eliminated.
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    \end{minipage}
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    { 
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    % Now we have $n/2$ pairs $(H_1,H_2)$, where $H_i\in S_i$. Let $l_i$ be the intersection of $H_i$ and $x_1x_2$ plane.
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    % Let $H_{x_i}$ be the linear combination of $H_1$ and $H_2$ s.t. $x_i$ is eliminated.
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    By the previous lemma, calling oracle on $l_{x_1}$ and $l_{x_2}$ locate $x^*$ with respect to at least one of $H_1$ and $H_2$.}
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    \newpage
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    By the previous lemma, calling oracle on $l_{x_1}$ and $l_{x_2}$ locate $x^*$ with respect to at least one of $H_1$ and $H_2$.
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    \framebreak
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    Input: $S_1,S_2$ and the pairs.
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    \begin{enumerate}
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        \item recursively locate $x^*$ respect to $B(d-1)n/2$ hyperplanes($H_{x_i}$) with $A(d-1)$ oracle calls in $S_1$.
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										11
									
								
								readme.md
									
									
									
									
									
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							@@ -0,0 +1,11 @@
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To use this theme:
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1. install fonts. [FiraGO](https://github.com/bBoxType/FiraGO), [firamath](https://github.com/firamath/firamath)(build from source) and [Source Han Sans SC](https://github.com/adobe-fonts/source-han-sans/releases).
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2. use xelatex. `.latexmkrc` generated by chatgpt
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```latexmk
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$pdf_mode = 1;
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$latex = 'xelatex %O %S';
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$pdflatex = 'xelatex %O %S';
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$dvi_mode = 0;  
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$postscript_mode = 0;
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```
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