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Edward Evans
  • Member for 6 years, 4 months
  • Last seen more than a week ago
  • Heidelberg, Deutschland
30 votes
Accepted

Twin prime conjecture proof error

19 votes

Amazing isomorphisms

12 votes

Why does $\frac{1}{4}x^{-3/4} = \frac{1}{4x^{3/4}} = \frac{1}{4\sqrt[4]{x^3}}$?

8 votes
Accepted

Mathematical writing guidelines

7 votes
Accepted

Proof that $e^{-x} \ge 1-x$

5 votes

Why is the absolute value of a equal to -a when a < 0?

5 votes
Accepted

How is "integers mod n under addition" a cyclic group?

4 votes
Accepted

Definition of a Zero Divisor Clarification

4 votes
Accepted

Solve the following system of ODEs:

4 votes

Show that if $p$ is a prime such that $p|(2^{64}+1)$ then $p \equiv 1 $ (mod 128)

4 votes
Accepted

Finding units in the ring of integers

4 votes
Accepted

The Galois group acts on prime factors of an ideal of an integer ring as a permutation?

4 votes

In $Ax=b$. If $A$ is not invertible there are no solutions or infinity. How to determine what the case is?

3 votes

What is the isomorphic graph of k4?

3 votes

What is the difference between Mapping and Morphism

3 votes
Accepted

Find the number of elements in a quotient ring satisfying $a^2 = a$

3 votes
Accepted

Is $x - 4.5$ algebraic expression

3 votes

What will be the Taylor series and the radius of the convergence of $\frac{1+x}{1-x}$

3 votes

Is the expression $\frac{x}{x+5}$ a polynomial

3 votes

How can I get better at integration?

3 votes
Accepted

Equality of fields being deduced from isomorphism of Galois groups

2 votes

Prove that quadratic field Q(√2) is closed

2 votes

Prove $gcd(m,n)=p\implies Φ(mn)=(p/p-1)Φ(m)Φ(n)$

2 votes

Finding area under curve using integrals.

2 votes

How many unique ways are there to arrange the letters in the word HATTER?

2 votes

Closure under matrix multiplication for 2x2 matrices

2 votes
Accepted

Galois group is determined by action on roots of polynomial

2 votes

How can I prove that $G/M\cap N \cong M/(M\cap N) \times N/(M\cap N)$ where $M,N \triangleleft G$ and $M.N=G$?

2 votes

Pell's equation and fundamental units

2 votes

Solving the 24 Game for 5, 5, 5 and 1