Tuesday, 12 March 2013

elementary set theory - Are the sets mathbbR and mathbbR>0 equinumerous?

Are the sets R and R>0 equinumerous, so is there a bijective function between these sets? And what's the best way to find such a function if it exists?

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...