HP 40gs - Manual (Page 273)

Equation Writer 15-21
Short-cut keys In the Equation Writer, the following are short-cut keys to
the symbols indicated:
0 for ∞
1 for i
3 for π
5 for <
6 for >
8 for ≤
9 for ≥
hp40g+.book Page 21 Friday, December 9, 2005 1:03 AM