/$ f(t) := {(x, y, z) | x in {t..2*t} & (y, z) = (x^2, x^3)} $/
/$ c1 := f(1) $/

/$ c2 := Sum[x in {1..2}] Sum[y in {x^2}] (x*y) $/

/$ c3 := Prod[x in {1..-1}] x^x $/

/$ c4 := U[x in {-2..2} & x mod 2 = 1] {|x|} $/

/$ r(s, t) iff Sec[x = s V x = t] {x^2} = {1} $/
/$ c5 := r(-1, 1) $/

test:
\begin{verbatim}
cmd:>pp(c1)
"{(1, 1, 1), (2, 4, 8)}"
cmd:>pp(c2)
"9"
cmd:>pp(c3)
"1"
cmd:>pp(c4)
"{1}"
cmd:>pp(c5)
"true"
\end{verbatim}