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Apr
8
revised Problem on a square group
stuck in a pair of parentheses for clarity
Apr
2
revised Show that K is a splitting field for some degree 4 polynomial f(x) in k[x].
Just added a bunch of dollar signs, to make it proper TeX.
Mar
5
revised A question about the additive group of the $p$-adic integers
Complete rewrite.
Mar
4
revised Prove that volume of a sphere with radius $r$ is $V=\frac43r^3\pi$
gave up my partial answer in favor of the more complete answer of KittyL, and offered an alternative.
Feb
8
revised Factoring polynomial in prime field
correcteed an unaccountable careless error
Jan
19
revised If $x^2+x+1=0 $, then find the value of $(x^3+1/x^3)^3$?
corrected an embarrassing and misleading typo
Jan
19
revised Laurent series for $\frac1{z^2+1}$
There was a topo in the numerator of the outside factor of the last sum. I’ve cofrrected it. —Lubin
Jan
16
revised Is $\sqrt[3]{5}$ in $\mathbb Q(\sqrt[3]{2})$?
Gave alternative argument, by factoring 5.
Jan
13
revised Find the point on the curve farthest from the line $x-y=0$.
added 1 character in body
Jan
11
revised How many elements does $\mathbb Z_7[i]/\langle i+1\rangle$ have?
added 28 characters in body
Jan
5
revised Rationalizing the denominator in general
clarification
Nov
29
revised Determine the minimal polynomial of $\sqrt 3+\sqrt 5$
added 450 characters in body
Nov
28
revised Let $y^2 = x^3 + Ax + B$ be a curve and $y = m(x - x_1) + y_1$ tangent at $x_1$. Why is $x_1$ then a double root?
Complete rewrite!
Nov
7
revised Is there a rationality-preserving order isomorphism between $\mathbb{Q}$ and two disjoint open intervals?
Admitted that my “solution” of the problem was no such thing. Drat.
Nov
7
revised Is there a rationality-preserving order isomorphism between $\mathbb{Q}$ and two disjoint open intervals?
changed an insufficient answer to a sufficient one, I hope.
Oct
24
revised Question about laurent series
left off a crucial minus sign in a fmla
Sep
17
revised finding “exp(1)” in the p-adic numbers
slipped and gave the formal-group logarithm, not the genuine one. Now corrected
Aug
25
revised Disproving an “almost true” trigonometric identity
Gave an alternate, longer, less magical, proof.
Aug
25
revised Disproving an “almost true” trigonometric identity
deleted 14 characters in body
Aug
25
revised Disproving an “almost true” trigonometric identity
Correct two even more embarrassing careless errors