- 506

- 303

That reminds me of a statistics course lecture. The lector said something like "..and since ##f## is injective, it is invertible..". Similarly, in algebra, saying something is a subgroup of ##G## is to be read as "is an isomorphic copy of a subgroup of ##G##".Hey, I was lazy: "<" is on the keyboard ##"\leq"## is not. These details are trivial and left to the reader ;-)