Posted by Stephanie on Thursday, September 27, 2007 at 10:54pm.
If b is an integer factor of b, and b is an integer factor of x, then
b = ma and c = nb, where m and n are both integers.
It follows that c = m n a. Since m and n are both integers, so is mn. Therefore a is an integer factor of c, or, in other words, "a divides c".
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