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Mathematics
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John Machacek

York Science Fellow at York University.

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Top posts (52) All Questions Answers | Votes Newest

128 Why do we still do symbolic math? Jul 29 '14
20 The role of 'arbitrary' in proofs Jun 13 '14
10 Combinatorial identity Jun 8 '14
7 Mathematician who talked about the probability of a “good” graph? Jul 26 '14
6 Show that the image of a linear transformation is equal to the kernel Jul 23 '14
6 Soft question about the square root Jun 19 '14
5 Show $L_1 \subseteq L_2$ or $L_2 \subseteq L_1$ Jun 29 '14
4 Prove that $X^{\phi{(n)}}-[1]$ has exactly $\phi{(n)}$ roots in $\mathbf{Z} / n \mathbf{Z}$. Jun 6 '14
3 Find all triples of positive integers a,b and c satisfying the equations: $ (a,b,c)=10$ and$ [a,b,c]=100$ simultaneously. Jun 18 '14
3 Evaluate the sum ${n \choose 1} + 3{n \choose 3} +5{n \choose 5} + 7{n \choose 7}…$ in closed form Jul 4 '14
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