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Elements of a ring

by Stephen88
Tags: elements, ring
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Stephen88
#1
Apr2-12, 03:19 AM
P: 33
f:R->S is a homomorphism of rings,such that kernel of f has 4 elements and the image of f has 16.How many elements has R?
16=|Im ( f )|=|R/ker f|=|R|/|ker f|=|R|/4=>|R|=4*16=64
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