Tom Oldfield

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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!


158 Answers

newest activity votes
13
Prove $G/\ker \phi \times \ker \phi \cong G$
feb 18 at 0:13
10
Why must we distinguish between rational and irrational numbers?
dec 9 at 20:09
10
How to understand why $x^0 = 1$, where $x$ is any real number?
nov 15 at 23:41
8
Combinatorial proof of $\sum^{n}_{i=1}\binom{n}{i}i=n2^{n-1}$.
may 11 at 15:47
8
What is the negation of “Subset”?
apr 7 at 19:26
8
Find $\int e^{-x}\cos x\,dx$ without using complex numbers
feb 19 at 11:48
7
Application of the Identity Theorem to $|x|^3$ for $-1<x<1$
may 20 at 19:27
6
Image of function definition notation
dec 30 at 20:20
6
Negating “Zach blocks e-mails and texts from Jennifer”
dec 11 at 1:59
6
Suppose there are two different spanning trees for a simple graph. Must they have an edge in common?
dec 10 at 22:50
6
If a $2 \times 2$ matrix $A$ has $0$ as an eigenvalue why does $e^A$ have $1$ as an eigenvalue?
dec 9 at 21:42
5
Show that $\mathbb{Z}[x]=\lbrace \sum_{i=0}^{n}{a_ix^i}:a_i \in \mathbb{Z}, n \geq 0 \rbrace$ is not a principal ideal ring.
mar 25 at 20:15
5
Why cannot the permutation $f^{-1}(1,2,3,5)f$ be even
mar 25 at 18:30
5
Vector-space almoast linear function
feb 26 at 20:41
5
Anything faster than matrix exponentiation by squaring?
dec 9 at 17:32
4
If $\dim(A+B)=\dim(A\cap B)+1$, then $A \subset B$ or $B \subset A$
apr 10 at 18:03
4
Dual Space Questions
apr 7 at 21:11
4
Ring of all continuous functions from reals into reals is not integral domain
feb 24 at 23:35
4
Determine a formula for a dual basis.
jan 2 at 0:50
4
abelian and finite group
dec 26 at 20:32
4
No group can have exactly 3 elements of order 3 (T/F)?
dec 11 at 22:46
4
left regular representation of $G$ with respect to $g$
dec 9 at 19:30
4
The difference between m and n in calculating a Fourier series
nov 20 at 12:27
4
What exactly does conjugation mean?
nov 11 at 13:51
4
How can we describe isomorphism in a tangible way?
oct 28 at 14:36
3
Linear transformation invertible or not?
may 25 at 19:04
3
Express $4+\sqrt{-2}$ as a product of irreducibles
may 17 at 21:56
3
If $f:\mathbb{R}\to\mathbb{R}$ is continuous and $f(x)=c$ for all $x\in\mathbb{Q}$, then $f(x)=c$ for all $x\in\mathbb{R}$
apr 7 at 23:51
3
Determining whether the following is homomorphism
apr 7 at 20:09
3
Need help in solving this differential equation, understand hint given but still clueless.
apr 6 at 23:00
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