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Learning is a mess
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  • Between Good and Bad
10 votes
4 answers
3k views

Map closed under addition but not multiplication

8 votes
4 answers
3k views

Why is the Riemann sphere the compactified complex plane?

7 votes
5 answers
305 views

How do I calculate $\lim_{x\rightarrow 0} x\ln x$

3 votes
2 answers
288 views

Is there an image to the point at infinity through this map?

3 votes
0 answers
58 views

Quickest definition of the distance on the circle

3 votes
2 answers
8k views

Rank of a matrix and dimension of the image

3 votes
2 answers
746 views

Does an injective function always have a left inverse?

2 votes
0 answers
113 views

Conformal map from the inside of the unit disk to the inside of an ellipse [duplicate]

2 votes
2 answers
49 views

Linear algebra: diagonalisation of antisymmetrisation

2 votes
0 answers
602 views

Cylindrical waves

2 votes
2 answers
27 views

Identifying a function

2 votes
3 answers
118 views

Bijection from $\mathbb{N} \to \mathbb{N}$

2 votes
2 answers
54 views

Proof in ring homomorphism

2 votes
1 answer
242 views

Ambiguous definition of a set

1 vote
1 answer
276 views

Solving this quant interview question

1 vote
1 answer
119 views

Runge Kutta error estimation

1 vote
2 answers
98 views

Abstract/formal interest of rings

1 vote
1 answer
58 views

Why are we losing one degree of freedom in this $\chi^2$ variable?

1 vote
1 answer
812 views

Solving wave eigenmodes in a cylinder

1 vote
3 answers
2k views

Looking for a quick way to prove a matrix identity

1 vote
2 answers
1k views

Does holomorphic mean invertible?

1 vote
2 answers
177 views

How do you integrate$\int_{-\infty}^{\infty} dw \frac{1}{(\alpha^2-w^2)^2+ w^2\beta^2} $

1 vote
2 answers
94 views

Property on homomorphism between finite groups

1 vote
2 answers
739 views

Distribution of the intersection between a grid and a circle

0 votes
0 answers
50 views

Positive solutions of a diophantine equation

0 votes
1 answer
518 views

Degenerate eigenvalue and minimal polynomial

0 votes
1 answer
29 views

Bound on numerical integral

0 votes
1 answer
126 views

Looking for interesting problems to solve numerically

0 votes
1 answer
119 views

Elementary exercise on cosets

0 votes
1 answer
40 views

Homomorphism theorem and group product