New posts in functions

If $(f ∘ f)$ is differentiable, is $f$ also differentiable?

calculus functions derivatives function-and-relation-composition

Is that true that not every function $f(x,y)$ can be writen as $h(x) g(y)$? [closed]

Characterization of continuous functions with the property $f(x) = f\left(\frac{x}{1-x}\right)$ [closed]

real-analysis functions continuity functional-equations

how to prove that this function is not injective

Olympiad-style question about functions satisfying condition $f(f(f(n))) = f(n+1) + 1$

elementary-number-theory functions

Why is the argument on the right?

functions soft-question notation math-history convention

When is the derivative of $f(g(x))$ equal to $g(f'(x))$?

real-analysis functions derivatives chain-rule

$f$ continuous s.t $|f|$ increasing and $|f|\le x$ then $f$ unifrmly continuous

functions continuity monotone-functions

Find the range of $y = \sqrt{x} + \sqrt{3 -x}$

"A Function Can't Be Odd&Even" They said, Right? [duplicate]

determine whether $f(x, y) = \frac{xy^3}{x^2 + y^4}$ is differentiable at $(0, 0)$.

calculus multivariable-calculus functions derivatives

Misleading Definitions and Unanswerable Problems in Spivak's Calculus

functions elementary-set-theory definition

$f(nx)\to 0$ as $n\to+\infty$

real-analysis limits functions

A strange bijection without fixed points

combinatorics functions discrete-mathematics ergodic-theory

What happens to a function when it is undefined?

algebra-precalculus functions

How to prove $1+x \leq e^x~\forall x \in \mathbb{R}?$

functions exponential-function

Is the set of surjective functions from $\mathbb{N}$ to $\mathbb{N}$ uncountable?

elementary-set-theory functions

Can $f(x)=\frac{1}{\frac{1}{x}}$ always simplify to $f(x)=x$? Is f(0) = 0 or undefined? [duplicate]

functions real-numbers infinity

Is $\frac{1}{\frac{1}{x}}$ defined at $x=0$?

functions real-numbers infinity

Functions with $\mathrm s(x)^n+ \mathrm c(x)^n \equiv 1$

integration functions indefinite-integrals special-functions functional-equations