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Jan
31
revised Put $A\cos(x) + B\sin(x)$ into form : $A\sin(x+ \theta)$
edited body
Jan
29
revised Find roots or splitting field of a polynomial given its Galois group
left out asquare root!
Jan
18
revised Find the angle between planes given three lines
give proper credit to a commenter
Jan
11
revised Describe the rational points on $y^2 = 11 - 2x^3$
added 1353 characters in body
Jan
11
revised Describe the rational points on $y^2 = 11 - 2x^3$
added 1353 characters in body
Jan
9
revised Proof that nonconstant polynomial cannot have the same value at all integer points
added 1113 characters in body
Dec
26
revised Finding an example of a non-rational p-adic number
corrected an embarrassing error, thanks to Paul Garrett.
Dec
22
revised Showing that a third degree polynomial with roots in terms of roots of fourth degree polynomial has rational coefficients
corrected a typo already pointed out by another commenter.
Dec
22
revised Showing that a third degree polynomial with roots in terms of roots of fourth degree polynomial has rational coefficients
rewrote completely
Dec
16
revised What is the general equation of an ellipse that is not aligned with the axis?
considerable expansion
Dec
3
revised If $a$ and $b$ leave the same remainders when divided by $n$, so do $a^k$ and $b^k$ for all $k \in \mathbb{N}$
fixed title only, setting it into (approximately) proper MathJax
Nov
28
revised Determine all of the monic irreducible polynomials in $\mathbb Z_3 [x]$ of degree $4.$
clarification
Nov
25
revised Find a spherical triangle with angle sum $5π/3$
Corrected the title with the appropriate mathJax
Nov
24
revised Is $\mathbb{Q}(\sqrt{5}, \alpha)$ over $\mathbb{Q}(\alpha)$, where $\alpha$ is the real seventh root of $5$ a the splitting field?
supply ¿illuminating? example.
Nov
14
revised A theorem on p-adic power series
discussed in (I hope) adequate detail issues that came up in the comments.
Nov
14
revised How can I calculate the angle between two lines on a sphere?
Since Michael Biro deleted his answer, I had to insert a statement of the Law of Cosines.
Nov
9
revised Prove that if $\{u_1 ,\dots , u_k, v\}$ is linearly dependent then $v\in\text{span}\{u_1 ,\dots , u_k\}$
Put it all in semiproper TeX
Nov
6
revised n-th power residues in p-adic fields
deleted 1 character in body
Oct
24
revised A plane,sphere and line all in an inequality
corected a typo and absence of a minus sign
Oct
23
revised A plane,sphere and line all in an inequality
Extensive expansion, explaining my own method, as requested by OP.