User:Endersdouble/Blah

$$  \begin{tabular}{|c|c|c|c|c|} \hline $[a,b] \times [c,d]$ & $a, b \leq 0$ & $a \leq 0 \leq b$ & $b \leq 0 \leq a$  & $0 \leq a,b$ \\ \ \hline $ 0 \leq c, d$ & $[ad,bc]$ & $[ad,bd]$ &  $[ac,bc]$ &  $[ac,bd]$ \\ \hline $ d \leq 0 \leq c$ & $[bd,bc]$ &  $[0,0]$ &    $[q,p]$  &  $[ac,ad]$ \\ \hl\ ine $ c \leq 0 \leq d$ & $[ad,ac]$ &  $[p,q]$ &    $[0,0]$  &  $[bc,bd]$ \\ \hl\ ine $ c, d \leq 0$ & $[bd,ac]$ & $[bc,ac]$ &  $[bd,ad]$ &  $[bc,ad]$ \\ \hline \end{tabular}

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