# Number theory (Primes)

• Sep 8th 2009, 05:04 PM
manusform
Number theory (Primes)
*Determine whether the following assertions are true or false. if true, prove the result, and if false, give a counter example

3. If b/(a^2-1) then b/(a^4-1).
• Sep 8th 2009, 05:07 PM
Bruno J.
$a^4-1=(a^2-1)(a^2+1)$
• Sep 8th 2009, 05:10 PM
manusform
pls can u elaborate it
bruno can u pls elaborate it. i don't get it..is it false or true? pls
• Sep 8th 2009, 05:15 PM
Bruno J.
If $m|a$, does $m|ab$ for every $b$? What does " $m|a$" mean?