### Answers (129)

 16 Is there a function for every possible line? 14 One lily pad, doubling in size every day, covers a pond in 30 days. How long would it take eight lily pads to cover the pond? 9 Modular congruence not adding up 9 Why multiplication of matrix is not done in the same way as matrix addition (i.e. adding corresponding entries)? 8 Left-multiplication of a finite field element - Matrix representation

### Reputation (3,463)

 +10 How is this tensor product working +10 How to solve a matrix multiplication that results in zero? F*x = 0 +10 Why is a Nonzero Ideal of $\mathcal{O}_K$ Free of Rank $n$? +10 Physical meaning of the various types of boundary conditions for a vibrating string

### Questions (9)

 5 Why Can we Write the Ray Class Group as a Quotient of Monoids 4 Does this Definition of an Ideal Assume a Commutative Ring with Unity 3 Why Does the Definition of a Topology via Neighborhoods Include This Axiom 3 Relationship Between Characteristic Polynomial and an Eigenvalue which is not in the Field of Scalars 3 Why is a Nonzero Ideal of $\mathcal{O}_K$ Free of Rank $n$?

### Tags (104)

 45 linear-algebra × 28 20 graphing-functions × 4 30 algebra-precalculus × 9 18 calculus × 13 23 abstract-algebra × 15 16 sequences-and-series × 4 23 functions × 12 11 complex-analysis × 11 21 matrices × 7 11 vector-spaces × 6

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 1403 Visually stunning math concepts which are easy to explain 807 The staircase paradox, or why $\pi\ne4$ 761 Different methods to compute $\sum\limits_{k=1}^\infty \frac{1}{k^2}$ (Basel problem) 718 What's an intuitive way to think about the determinant? 663 What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) [closed]

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