Tom Oldfield

less info

network profile

4,482 reputation

524

bio	website
	location
	age
visits	member for	8 months
	seen	15 hours ago
stats	profile views	348

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!

summary answers questions tags badges favorites bounties reputation activity

158 Answers

votes activity newest

13	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	Combinatorial proof of $\sum^{n}_{i=1}\binom{n}{i}i=n2^{n-1}$.
8	What is the negation of “Subset”?

view more

4,482 Reputation

+5	Invertible Matrices over a commutative ring and their determinants.
+35	Is there a name of this function?
+10	Showing that two real matrices are not congruent over $\mathbb{Q}$
+15	Finding the number of solutions of a complex valued function $f(z) = z^n$

view more

4 Questions

votes activity newest

8	When is an accumulation point not the limit of some sequence in a topological space?
3	Invertible Matrices over a commutative ring and their determinants.
2	Independence of the first passage time of a Markov chain being less than or equal to $n$ and $X_n$
0	What is the meaning of detailed balance in Markov Chains?

93 Tags

65 abstract-algebra × 22	20 discrete-mathematics × 4
48 homework × 24	19 combinatorics × 9
46 linear-algebra × 25	18 functions × 6
38 group-theory × 16	16 calculus × 10
29 real-analysis × 20	16 complex-analysis × 9

view more

4 Accounts

$Mathematics Stack Exchange$	Mathematics	4,482 rep	524
	Physics	123 rep	3
	Stack Overflow	101 rep
$TeX - LaTeX Stack Exchange$	TeX - LaTeX	101 rep

22 Badges

recent class name

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

view more

0 Active bounties

active offered earned

This user has no active bounties

566 Votes Cast

all time			by type			month		week
545	up		367	question		52		16
21	down		199	answer		52		16

Technology			Life / Arts	Culture / Recreation	Science	Other
Stack Overflow Server Fault Super User Web Applications Ask Ubuntu Webmasters Game Development TeX - LaTeX	Programmers Unix & Linux Ask Different (Apple) WordPress Answers Geographic Information Systems Electrical Engineering Android Enthusiasts IT Security	Database Administrators Drupal Answers SharePoint User Experience Mathematica more (14)	Photography Science Fiction & Fantasy Seasoned Advice (cooking) Home Improvement more (13)	English Language & Usage Skeptics Mi Yodeya (Judaism) Travel Christianity Arqade (gaming) Bicycles Role-playing Games more (21)	Mathematics Cross Validated (stats) Theoretical Computer Science Physics more (7)	Stack Apps Meta Stack Overflow Area 51 Stack Overflow Careers

site design / logo © 2013 stack exchange inc; user contributions licensed under cc-wiki with attribution required

rev 2013.6.19.749