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Hermis14's user avatar
Hermis14's user avatar
Hermis14
  • Member for 8 years
  • Last seen this week
6 votes
Accepted

Is every proposition regarding an empty set true?

4 votes

Why do you calculate the dot product that way?

4 votes
Accepted

Epsilon-Delta proof of an infinite limit

4 votes

If $\lim_{x\to c}f'(x)=A$ then $f'(c)=A$

4 votes
Accepted

Understanding implications

3 votes
Accepted

Can we take the exponential function of a vector?

3 votes

dot product between vector and matrix

3 votes
Accepted

Prove that $\frac{e^x-1}{x}$ is bijective

3 votes
Accepted

How do I compute the area of Steinmetz solid?

3 votes
Accepted

What does the "$\exists !$" modified quantifier mean in mathematical proof? eg, "$\exists\ !x \ P(x)$"

3 votes

Finding a function that oscillates between 0 and 1

3 votes
Accepted

prove that $f(x,y)=|xy|$ is differentiable at (0,0) using $\epsilon_1,\epsilon_2$ definition

2 votes

"Sequence-builder" notation

2 votes

ODE: The Lyapunov stability of a set

2 votes

Solve the equation $(5-x)^4+(2-x)^4=17$

2 votes
Accepted

Is $\forall x,\exists y (x \ge y^2 \Rightarrow x>0)$ same as $\forall x (\exists y: x\ge y^2\Rightarrow x > 0)$

2 votes
Accepted

Rotating 3D coordinates to 2D plane

2 votes

Proofs in Real Analysis are too 'convenient'

2 votes
Accepted

How can we verify this limit via $\epsilon-\delta$ method?

2 votes

Proof verification in multi-variable calculus using $\epsilon-\delta$ statement

2 votes

For this limit $\lim_{x \to 5}{\sqrt{x-1}}=2$ find $ δ$

2 votes

Critique my proof of: P → (Q → R). Then ¬R → (P → ¬Q)

2 votes
Accepted

Corestriction of a continuous function remains continuous

2 votes

Is the relation $\{(x^4,x):x\in\mathbb{R}\}$ a function that maps from $\mathbb{R}$ to $ \mathbb{R}$?

2 votes
Accepted

How can I show that this set is bounded?

2 votes
Accepted

Show that $f(A)^c\subseteq f(A^c)$ if and only if $f$ is injective

2 votes
Accepted

True or false: $x^{T}A^{T}Ax\geq 0$

2 votes

Wrong answers to simple trigonometry questions

2 votes

What is $f(a,0)$ for $f(a,y) = \frac{e^{-ay}-e^{-by}}{y}$

2 votes

What is the difference between $e^{it}$ and $e^{st}$