Friday, 18 January 2019

reference request - Overview of basic results about images and preimages

Are there some good overviews of basic facts about images and inverse images of sets under functions?

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...