Title: On van Kampen-Flores, Conway-Gordon-Sachs and Radon theorems,
Abstract: We exhibit relations between van Kampen-Flores, Conway-Gordon-Sachs and Radon
theorems, by presenting direct proofs of some implications between them. The
key idea is an interesting relation between the van Kampen and the
Conway-Gordon-Sachs numbers for restrictions of a map of $(d+2)$-simplex to
$\mathbb R^d$ to the $(d+1)$-face and to the $[d/2]$-skeleton.