Question

is this step even allowed? if so, why?

Answer 1

I don't think so but what do I know... laughing out loud

Answer 2

@kinggeorge

Answer 3

it looks reasonable

Answer 4

\(i_0\) doesn't seem to be quantified in the first statement so I don't see what's inappropriate about the statemetn...

Answer 5

well, yes it does seem reasonable, and I have no doubt that it is false. however, what i'm looking for is why? from definition? or theorem?

Answer 6

what are you trying to prove?

Answer 7

it came from this exercise.

Number 22. The book says it's correct.

Answer 8

is that the first or second half of the proof?

Answer 9

first half. But it seems the statement I posted is used in both first and second half of the proof

Answer 10

ugh, I would help you, but I think it's too late at night for my brain to function properly. Sorry.

Answer 11

that's alright lol