as a math major i had the same confusion; for such that i use "s.t.". but apparently peano used ∋ to mean such that: https://math.stackexchange.com/questions/1

as a math major i had the same confusion; for such that i use "s.t.". but apparently peano used ∋ to mean such that: https://math.stackexchange.com/questions/15455/backwards-epsilon/15460#15460 https://math.stackexchange.com/questions/15455/backwards-eps...