Blog
/ Academics & Research
Lessons from Loomis and Whitney a math month post

function: $\mathbf{1}_A$, which is 1 on the set $A$ and is 0 otherwise. I.e., \[\mathbf{1}_A(x,y,z) = \begin{cases}1 & (x,y,z) \in A \\ 0 & (x ... the LHS is 0-- Why?? Similarly, if the RHS is zero, then one of the