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sombra
 Post subject: ring homomorphisms
PostPosted: Wed, 5 Nov 2008 19:49:00 UTC 
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Joined: Mon, 20 Oct 2008 00:45:03 UTC
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let psi be a mapping from R to F, with R a ring and F a field and psi a homomorphism of rings. If R has a unit element 1 how to show with psi(1) =1 or psi(a) = 0 for all a in F?
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sombra
 Post subject: ring homomorphisms
PostPosted: Wed, 5 Nov 2008 19:50:33 UTC 
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oops sorry, not with but either
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