Parth Kohli
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 Dec 22 answered Books in foundations of mathematical logic Dec 22 revised Is a counterexample considered a rigorous proof that a property is not true? added mathjax; fancy quotes Dec 22 suggested approved edit on Is a counterexample considered a rigorous proof that a property is not true? Dec 22 answered Given real numbers: define integers? Dec 22 comment Is a counterexample considered a rigorous proof that a property is not true? +1 Love it! :-) Dec 22 comment Is a counterexample considered a rigorous proof that a property is not true? +1 Simple and sweet :) Dec 22 asked Is a counterexample considered a rigorous proof that a property is not true? Dec 22 revised How can I algebraically prove that $2^n - 1$ is not always prime? added 30 characters in body; edited title Dec 22 accepted How can I algebraically prove that $2^n - 1$ is not always prime? Dec 22 comment How can I algebraically prove that $2^n - 1$ is not always prime? @Markbennet: Oh yes, thanks. Dec 22 comment How can I algebraically prove that $2^n - 1$ is not always prime? And what would be the factored form of $2^{ab} - 1$? :-) P.S.: Hey Brian! Dec 22 comment How can I algebraically prove that $2^n - 1$ is not always prime? I like it :-). So, the main point of our proof is that it is not prime since it has factors. Dec 22 comment How can I algebraically prove that $2^n - 1$ is not always prime? It should be a formal proof :) Dec 22 comment How can I algebraically prove that $2^n - 1$ is not always prime? It is a proof... Dec 22 asked How can I algebraically prove that $2^n - 1$ is not always prime? Dec 22 answered Show that $\gcd(a,b)=|a| \iff a | b$ Dec 21 answered Is zero odd or even? Dec 21 comment A pencil approach to find $\sum \limits_{i=1}^{69} \sqrt{\left( 1+\frac{1}{i^2}+\frac{1}{(i+1)^2}\right)}$ @Quixotic: Why do I always find you on different sites? :O Dec 20 answered $2^{10 - x} \cdot 2^{10 - x} = 4^{10-x}$ Dec 19 comment How to multiply out a statement form? +1 for formatting :)