[math-fun] eta as theta

oo pi 1/6 /===\ Theta (--, q ) 1/24 | | k 2 6 eta(q) := q | | (1 - q ) = ---------------- . | | sqrt(3) k = 1 This can't be new. Why isn't it more prevalent? Instead I've been using a bletcherous Thetaprime_1(0,sqrt(q)) for (q;q)_oo in the q-Gamma/q-factorial reflection (and q-sin) formulae. --rwg