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Cure's user avatar
Cure's user avatar
Cure
  • Member for 10 years, 11 months
  • Last seen more than 1 year ago
16 votes
Accepted

Show that the boundary of $A$ is empty iff $A$ is closed and open.

6 votes

How do I calculate derivative of sgn(x)

4 votes
Accepted

Given characteristic polynomial of $T$, need find characteristic polynomial of $T^3$

3 votes

How is this simplified?

3 votes
Accepted

Prove Linear Dependence in $T: V\to W$

2 votes

Given the following vector $X$, find a non-zero square matrix $A$ such that $AX=0$:

2 votes
Accepted

Unable to understand the following proof

2 votes

Integration By Parts with a definite integral

1 vote

Is $\{ (3,0,0) , (1,1,0) , (2,2,2) , (1,3,5) \} $ a basis for $\mathbb{R}^3$?

1 vote

Prove using complex numbers $e^{(x+y)} = e^x e^y$ for all $x,y$ complex.

1 vote

Multivariable Calculus Volume

1 vote

Integration of parabola

1 vote
Accepted

A marble in a pot

1 vote

Trivial sequence: $32,21,14,\dots$

1 vote

Evaluate $\displaystyle-\int e^{2x}\sin(e^{x})\ dx$

1 vote

$\operatorname{Span}(T) = \operatorname{Span}(T - \{v\})$

1 vote

Determining the infinite limit of a Riemann' sum

1 vote

Does this system has a solution?

1 vote

Chinese remainder theorem related proof

1 vote
Accepted

Finding the gradient of a given function

0 votes

Prove that $\lim_{x \to \infty} f(x) = \infty $

0 votes

Two subsets with the same span?

0 votes

Are these proofs correct?

0 votes

Discrete Mathematics - Show that a conditional statement is a tautology.

0 votes

Linear Algebra nullSpace and multiplication

0 votes
Accepted

Evaluate the integral $\int \frac{x^2(x-2)}{(x-1)^2}dx$

0 votes

Proving that the sequence $a_{n}= \frac{1}{n}$ ($n$ odd) and $\frac{3}{n}$ ($n$ even) converges.