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Dec
9
revised Finding a matrix knowing determinant
edited body
Nov
28
revised On a generalization for $\sum_{d|n}rad(d)\phi(\frac{n}{d})$ and related questions
added 1275 characters in body
Nov
27
revised Solve the pde : $x^2(y-z)\,\partial_x(z)+y^2(z-x)\,\partial_y(z)=z^2(x-y)$
mathjax and typo
Sep
24
revised Factorization in a Group
Added a reference and modification of the answer.
Mar
3
revised Is $53$ expressible in this form?
added 551 characters in body
Sep
26
revised Infinitely many primes congruent to 1 mod prime
The proof was incomplete
Sep
5
revised Number of pairs $(i, j)$ where $1\leq i < j \leq N$ such that $i|j$
added 148 characters in body
Sep
5
revised Number of pairs $(i, j)$ where $1\leq i < j \leq N$ such that $i|j$
Improved the image and hopefully the explanation
Apr
6
revised Comparing sums of surds without any aids
added 53 characters in body
Mar
31
revised Algorithm to find representation of an element of field extension $\mathbb{Q}(q)$ in the form $\sum a_i q^i$
added 125 characters in body
Mar
16
revised Partial fraction decomposition of p'/p
Removed the c
Mar
14
revised Reducing simultaneously a pair of fractions $\frac{a^2}{b},\frac{ a^3}{c}$ using only gcds
EDIT: Changed to make more clear the question.
Mar
14
revised Reducing simultaneously a pair of fractions $\frac{a^2}{b},\frac{ a^3}{c}$ using only gcds
Sorry the method I give is not correct
Dec
22
revised Generalizing Ramanujan's proof of Bertrand's Postulate: Can Ramanujan's approach be used to show a prime between $4x$ and $5x$ for $x \ge 3$
minor edit
Jun
21
revised How prove that:$\varphi(2)+\varphi(3)+\varphi(4)+\cdots+\varphi(n)\ge\frac{n(n-1)}{4}+1$
I have rewritten the proof as the original was very confusing and contained some incorrect statements.
Jun
21
revised How prove that:$\varphi(2)+\varphi(3)+\varphi(4)+\cdots+\varphi(n)\ge\frac{n(n-1)}{4}+1$
deleted 2 characters in body
Dec
1
revised Galois group and the Quaternion group
added 1 characters in body
Dec
1
revised Galois group and the Quaternion group
Added explanation
Nov
3
revised Half the rationals?
Added a generalization
Oct
15
revised Tiling a minimal perimeter region with $n$ unit squares
Sketch of proof