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formal languages - L ={a^n.b^n | n>=0} , what is difference between L^2 and L.L? - Computer Science Stack Exchange
How would you prove the identity [math] a^n - b^n = (a-b)(a^{n-1} + a^{n-2}b + ... + b^{n-2}a + b^{n-1})?[/math] - Quora
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inequality - Duplicate - Proof by Ordinary Induction: $a^n-b^n \leq na^{n-1}(a-b)$ - Mathematics Stack Exchange
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