Let be a ring in wich is the only nilpotent element ( ) . Prove that is invertible if and only if x is left invertible .

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- Oct 25th 2008, 03:59 AMpetterRing with 0 only nilpotent element
Let be a ring in wich is the only nilpotent element ( ) . Prove that is invertible if and only if x is left invertible .

- Oct 25th 2008, 08:39 AMOpalg
- Oct 27th 2008, 09:19 AMpetter
- Oct 27th 2008, 09:43 AMOpalg
- Oct 27th 2008, 12:12 PMpetter