New posts in functions

What function or equation can result in higher "division result"? like $\frac{f(x+100)} {f_(x+90)} > \frac{f(x+90)} {f(x+80)}$

functions polynomials

Let $f: \mathbb N \rightarrow \mathbb N$ are increasing function such that $f\left(f(n)\right)=3n$. Find $f(2017)$ [duplicate]

functions functional-equations

Continuous unbounded but integrable functions

real-analysis functional-analysis functions

Composition of 2 involutions

functions logic involutions

Determine $a \in \mathbb{R}$ such that $f_a(x)=\frac{1}{x-\log x+a}$ is defined for any $x>0$

real-analysis limits functions solution-verification

Why Is a Function Defined As Having Only One Y-Value Output?

Conditions Equivalent to Injectivity

functions elementary-set-theory

Confusion about the definition of function

functions elementary-set-theory definition

How to prove $(f \circ\ g) ^{-1} = g^{-1} \circ\ f^{-1}$? (inverse of composition)

algebra-precalculus functions inverse-function function-and-relation-composition

Show that Function Compositions Are Associative

functions elementary-set-theory function-and-relation-composition

Maps - question about $f(A \cup B)=f(A) \cup f(B)$ and $ f(A \cap B)=f(A) \cap f(B)$

functions elementary-set-theory proof-writing problem-solving

In written mathematics, is $f(x)$a function or a number?

functions notation

Show that there is no neighborhood of $0$ such that the function $f(x)=x \left[1+\sin^2 \frac{1}{x}\right]$ is increasing

analysis functions derivatives solution-verification

A mathematical function for denary to binary conversion.

Can there be a function that's even and odd at the same time?

algebra-precalculus functions even-and-odd-functions

If f(z) is analytic then u(x,y)=Re(f(x+iy)) is harmonic [duplicate]

analysis functions harmonic-functions

Is the absolute value function a linear function?

linear-algebra functions absolute-value

What does "piecewise definition ... is not a characteristic of the function itself" mean when referring to piecewise-defined functions?

algebra-precalculus functions

Punch 2000 holes in 2000 polygons with 1000 needles

If a function is Riemann integrable, then it is Lebesgue integrable and 2 integrals are the same?

calculus integration functions lebesgue-integral riemann-sum