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Christopher's user avatar
Christopher's user avatar
Christopher
  • Member for 11 years, 2 months
  • Last seen more than a month ago
88 votes

How to find center of a circle from only an arbitary arc of that circle

29 votes

Analogy between the fundamental theorems of arithmetic and algebra

27 votes

What is the limit of zero times x, as x approaches infinity?

13 votes
Accepted

Cancellation laws in Rings

12 votes

Understanding the definition of the limit of a sequence

11 votes
Accepted

2D Rubik's cube?

11 votes
Accepted

Can a set be closed in one topology but neither open nor closed in another?

10 votes

Are ideals also rings?

9 votes

For which $x$ is $e^x$ rational? Transcendental?

9 votes

Why are algebraic structures preserved under intersection but not union?

8 votes

does simple ring implies artinian ring?

8 votes
Accepted

If $|G|=p^nq$, then $G$ contains a unique normal subgroup of index $q$

7 votes
Accepted

Prove a (unital) ring with this property has no zero divisors?

7 votes

Simplify the expression (combination and factorial)

6 votes

How do I show that the following map establishes a bijection between $\mathbb Q$ and $\mathbb Z \times \mathbb{Z}_{>0}$

6 votes
Accepted

Prove $\chi(G)\chi(\bar{G}) \geq n$ for chromatic number of graph and its complement

5 votes
Accepted

If there exists $n>1$ such that $x^n=x$ for all $x$ in a ring, then there are no nonzero nilpotent elements.

5 votes
Accepted

Amount of homomorphisms $S_5$ to $C_6$

5 votes
Accepted

Show that R/P has only two elements if $R$ is a Boolean ring.

5 votes

What are perfect squares in general rings?

4 votes
Accepted

Is $R/bR$ reduced if $R$ is reduced and $\operatorname{Ann}(b)$ is a minimal prime of $R$?

4 votes
Accepted

A finite group with exactly $2$ conjugacy classes isomorphic to $\mathbb{Z}_2$

4 votes
Accepted

Examples for essential/superfluous submodules

4 votes

What does "copies" of a Ring/Module etc. mean

4 votes

In the category $\mathbf{Set}$ is "the product of an empty set of sets a one-element set"?

4 votes

Example of a ring where all but two of its elements are units

4 votes

Is there a word similar to "iff" meaning "one and only one"?

4 votes

Different formulations of the Law of Quadratic Reciprocity

4 votes
Accepted

Infinite number of intermediate fields between K(u,v) and K

4 votes
Accepted

Player has 3 weeks to prepare, plays at least 1 set daily, but not more than 36 in all. Show a period of consecutive days she plays exactly 21 sets

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