- #1
futurebird
- 272
- 0
Lets say that we know that for [tex]a \in A[/tex] and [tex]b \in B[/tex] where A and B are
ideals of R, [tex]a - b = 1[/tex]. Do we then know that [tex](a-b)(a-b) = a^2 -2ab+b^2
= 1[/tex]? In that case, what is the meaning of the number 2 in the term 2ab? We
don't know that 2 is in R, R could be anything.
ideals of R, [tex]a - b = 1[/tex]. Do we then know that [tex](a-b)(a-b) = a^2 -2ab+b^2
= 1[/tex]? In that case, what is the meaning of the number 2 in the term 2ab? We
don't know that 2 is in R, R could be anything.