Newbetuts

When $\delta$ decreases should $\epsilon$ decrease? (In the definition of a limit when x approaches $a$ should $f(x)$ approach its limit $L$? )

Limits of $ f(x,y) = y\ (1-x)^{y-2} $ reach contradiction

Fake proof that $\frac{e^x-1}{e^x+1}=e^x$, via integrating $\operatorname{sech} x$ in two ways

Detect Wrong Proof by strong induction $a^{n-1}=1$ for all $n$

A contradictory integral: $\int \sin x \cos x \, \mathrm dx$

Can't understand an ACT practice problem: Triangle appears to be isosceles, why isn't the answer $7.3\sim $ here?

Unexpected result from Euler's formula

Find a mistake in the following bogus proof

Contradiction with Power functions with odd exponent? [duplicate]

Where is the mistake in this "proof" of the inconsistency of ZFC?

Indefinite integral. Where is the mistake?

How does this proof of the regular dodecahedron's existence fail?

Problem with the Pythagorean theorem [duplicate]

A proof that $1=2$. May I know why it’s false? [duplicate]

Why is this $0 = 1$ proof wrong? [duplicate]

Integrate $1/x$ by parts.

New posts in fake-proofs

Why is $\mathcal{P}(A\cup B) \not\subset \mathcal{P}(A)\cup\mathcal{P}(B)$?

Why solving $\dfrac{\partial u}{\partial x}=\dfrac{\partial^2u}{\partial y^2}$ like this is wrong?

Continued fractions paradox [duplicate]

Incorrect proof of Hahn Banach Theorem

When $\delta$ decreases should $\epsilon$ decrease? (In the definition of a limit when x approaches $a$ should $f(x)$ approach its limit $L$? )

Limits of $ f(x,y) = y\ (1-x)^{y-2} $ reach contradiction

Fake proof that $\frac{e^x-1}{e^x+1}=e^x$, via integrating $\operatorname{sech} x$ in two ways

Detect Wrong Proof by strong induction $a^{n-1}=1$ for all $n$

A contradictory integral: $\int \sin x \cos x \, \mathrm dx$

Can't understand an ACT practice problem: Triangle appears to be isosceles, why isn't the answer $7.3\sim $ here?

Unexpected result from Euler's formula

Find a mistake in the following bogus proof

Contradiction with Power functions with odd exponent? [duplicate]

Where is the mistake in this "proof" of the inconsistency of ZFC?

Indefinite integral. Where is the mistake?

How does this proof of the regular dodecahedron's existence fail?

Problem with the Pythagorean theorem [duplicate]

A proof that $1=2$. May I know why it’s false? [duplicate]

Why is this $0 = 1$ proof wrong? [duplicate]

Integrate $1/x$ by parts.