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@@ -56,15 +56,15 @@ Three problems with this formulation:
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\begin{enumerate}
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\begin{enumerate}
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\item Finding the exact optimum is NP-hard. So we consider solving it approximately.
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\item Finding the exact optimum is NP-hard. So we consider solving it approximately.
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\item Companies may run multiple campaigns at the same time. So a trade-off curve between budget and profit will be useful.
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\item Companies may run multiple campaigns at the same time. So a trade-off curve between budget and profit will be useful.
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\item The multiple-choice constraint \textcolor{Red}{$|K\cap K_i|\leq 1$} is too weak for real-world applications.
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\item The multiple-choice constraint \textcolor{Red}{$|K\cap K_i|\leq 1$} is too strong for real-world applications.
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\end{enumerate}
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\end{enumerate}
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\end{frame}
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\end{frame}
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\begin{frame}{Linear programming relaxation}
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\begin{frame}{Linear programming relaxation}
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\textcolor{gray}{
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% \textcolor{gray}{
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\textbf{Input}: $n$ sets of coupons $K_1,\dots,K_n$. Each coupon $e\in K_i$ has a non-negative cost $c_e\in \Z_+$ and value $v_e\in \Z_+$. \st{A positive budget $b\in \Z_+$.}
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\textbf{Input}: $n$ sets of coupons $K_1,\dots,K_n$. Each coupon $e\in K_i$ has a non-negative cost $c_e\in \Z_+$ and value $v_e\in \Z_+$. \st{A positive budget $b\in \Z_+$.}
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}
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% }
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\pause
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\pause
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\begin{equation*}
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\begin{equation*}
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\begin{aligned}
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\begin{aligned}
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@@ -74,7 +74,7 @@ s.t.& & c\cdot x&\leq b & &\\
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\end{aligned}
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\end{aligned}
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\end{equation*}
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\end{equation*}
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\textbf{Output}: A compact representation of $\tau(b)$.
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\textbf{Output}: function $\tau(b)$ for $b\in (0,+\infty)$.
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\pause
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\pause
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We focus on 2 kinds of constraints of \textcolor{Plum}{$x_{K_i}\in P_{K_i}$}.
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We focus on 2 kinds of constraints of \textcolor{Plum}{$x_{K_i}\in P_{K_i}$}.
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