Tom Oldfield

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4,085 reputation

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I am currently an undergraduate maths student at Cambridge University, England.

I aim to answer what questions I can, understand some of those that I can't and improve the site however I can!

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145 Answers

votes activity newest

12	Prove $G/\ker \phi \times \ker \phi \cong G$
10	Why must we distinguish between rational and irrational numbers?
10	How to understand why $x^0 = 1$, where $x$ is any real number?
8	What is the negation of “Subset”?
8	Find $\int e^{-x}\cos x\,dx$ without using complex numbers

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4,085 Reputation

+10	Proving convergence of a sequence for all integers
+35	Prove that if $G$ is abelian, then $H = \{a \in G \mid a^2 = e\}$ is subgroup of $G$
+20	Express $4+\sqrt{-2}$ as a product of irreducibles
+15	Finite abelian $2$-group

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3 Questions

votes activity newest

2	Independence of the first passage time of a Markov chain being less than or equal to $n$ and $X_n$
2	Invertible Matrices over a commutative ring and their determinants.
0	What is the meaning of detailed balance in Markov Chains?

89 Tags

60 abstract-algebra × 20	19 discrete-mathematics × 4
44 homework × 22	18 combinatorics × 9
44 linear-algebra × 21	15 general-topology × 9
38 group-theory × 16	14 calculus × 9
26 real-analysis × 19	13 matrices × 4

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4 Accounts

$Mathematics Stack Exchange$	Mathematics	4,085 rep	524
	Physics	123 rep	3
	Stack Overflow	101 rep
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	101 rep

22 Badges

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Cleanup	Custodian × 6
Constituent	Critic
Talkative	Civic Duty
Caucus	Enlightened
Convention	Nice Answer × 3

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459 Votes Cast

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10	down		171	answer		84		3		3

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