A map f: X-> Y is said to be an open map if for every open set U of X, the set f(U) is open in Y. Show that [tex]\pi[/tex](adsbygoogle = window.adsbygoogle || []).push({}); _{1}:X x Y -> X and [tex]\pi[/tex]_{2}: X x Y -> Y are open maps...

I don't know where to begin with this...

Can someone give me an idea of where to start?

Thank You.

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# Open map

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