3. How to prove any absorbing element has no corresponding inverse element?

[Secret]

(Wondering whether my maths level is high enough to ask this question and understand the potential answers given, but here goes)

http://en.wikipedia.org/wiki/Inverse_element

Question is exactly what it says on the tin
P.S. It might help answering the question raised in thread #2 Any general proof that all expressions which are indeterminate forms are undefined in ALL CONCEIVABLE MATHEMATICAL STRUCTURES

 

[mathman]

It would help if you defined "absorbing element". I couldn't find it in the reference.