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inaccuracy

1. If not p then not q
I've always heard (even I believed) that if read not write (even say that approach could prove empirically, that no reduction to the absurd).

2 If p then not q if and only if q then p
A double negative is still the same as a reverse statement is not difficult to infer therefore that, because if you do not read not write, so if you read write.

3 If q then p
Today I have been able to experience unequivocally that if you read sooner or later end up writing, whatever, but writing (post or not.) 4Si

p then q and if q then p, then p if and only if q (or q is the same if and only if p). q are identical. Algebra does not fool
and surprisingly enough just to prove mathematically that reading and writing are identical, then write if and only if I read, and read if and only if I write.

Or maybe your hand, I feel much better ... Never finished exactly understand why they created so sweet that it is these small inaccuracies yours.