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| ``Re: Cartesian product''
by drini on 2004-10-01 12:35:30 |
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| oh my mistake, it was't about topological spaces but sets alone. But I still mention that it makes sense using \product (PI to denote arbitrary products (generalizing \times) just as \sum (SIGMA) denotes arbitrary sums (generalizing + )
f
G -----> H G
p \ /_ ----- ~ f(G)
\ / f ker f
G/ker f |
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