EuYu

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Mathematical Physics Major at the University of Waterloo


454 Answers

newest activity votes
6
How to solve this literal equation
6
How to prove that if $\det(A)=0$ then $\det(\operatorname{adj}(A))=0$?
6
Finding the smallest base
5
Find $M$, where $M^7=I$ and $M\neq I$, $M$ has only 0's and 1's.
5
How to prove there exist a cycle.
5
Let $M_{2\times 2}$ be the vector space of all $2\times 2$ matrices. Show that the set of non-singular matrices is NOT a subspace.
5
Inverse matrix's eigenvalue?
5
Determinant of a linear transformation defining matrix transpose
5
difference of square roots approximation
5
What is the average of rolling two dice and only taking the value of the higher dice roll?
5
How do you create a “stretch” transformation while keeping volume constant?
5
If $G$ is biconnected and $\delta(G) \geq 3 \Rightarrow \exists v: G-v$ is also biconnected.
5
What is the biggest positive integer within 100 that can be/can not be written as the differences between two positive primes?
5
Monty hall problem with leftmost goat selection.
5
Counting multidimensional lattice paths
5
Proving that $x^3 +1=15x$ has at most three solutions. in the interval [-4,4].
5
In the proof of Bolzano Weierstrass thm. about converging subsequences.
5
A sequence question
5
Formula for the sum of the squares of numbers
5
Determining the rank of a matrix based on its minors
4
Silliness: $\exists~X~\text{s.t.}~AX=B \iff B\in R(L_A)$
4
$(\mathbf{u}^T\mathbf{v})\mathbf{v} = \mathbf{u}^T(\mathbf{v}\mathbf{v})$ doesn't hold for $\mathbf{u}, \mathbf{v}\in\mathbb{R}^n$ - why?
4
Dimensions: $\bigcap^{k}_{i=1}V_i \neq \{0\}$
4
Number of permutations $\langle a_1,\ldots,a_n\rangle$ of $\{ 1,\ldots ,n \}$ with $a_{i+1} - a_i \ne 1$
4
What fields of math would be most interesting for non-mathematicians?
4
Solving $\sum_{x_2 = 0}^{2} \sum_{x_1 = 0 }^{2} c(x_1 + x_2) = 1$ for the constant $c$
4
let $A\in M_n\mathbb R$ .how prove these statements with following condition?
4
The Determinant of a Sum of Matrices
4
How to workout the determinant of the matrix $D_n(\alpha, \beta, \gamma)$.
4
Invariance of eigenvalues of a product of square matrices under cyclic permutation
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