List questions from examples-counterexamples

Published on 10 Sep 2016 - 3:27

69

Views

Example that you are tempted to use L'Hopital rule even if the limit does not exist

Published on 11 Sep 2016 - 21:33

426

Views

Closed Subspace of a Banach Space with a Non-closed Linear Complement

Published on 14 Sep 2016 - 3:25

147

Views

If a function $f : A \to B$ is not injective, is it possible that $g \circ f$ is injective?

Published on 14 Sep 2016 - 7:55

93

Views

Is the following argument about L'Hopital's rule correct?

Published on 31 Mar 2026 - 8:12

12.7k

Views

Can someone give me an example of a challenging proof by induction?

Published on 28 Mar 2026 - 20:58

1.6k

Views

Proving H is NOT a subgroup of G given G is NOT abelian

Published on 15 Sep 2016 - 13:13

39

Views

summation equation

Published on 25 Mar 2026 - 17:35

4.9k

Views

Change of measure to make things "easier"?

Published on 15 Sep 2016 - 17:55

476

Views

Normalizer of Normalizer

Published on 28 Mar 2026 - 12:57

488

Views

Looking for counter-intuitive example for independence of random variables

Published on 30 Mar 2026 - 23:22

43

Views

Counter-examples to $x \not \in K \implies \Bbb Q(x) \cap K = \Bbb Q$

Published on 17 Sep 2016 - 12:21

315

Views

Finite-dimensional algebras which do not satisfy Wedderburn's principal theorem

Published on 17 Sep 2016 - 19:39

1.1k

Views

Simplest mixed tensor example

Published on 26 Mar 2026 - 19:14

139

Views

Cocontinuous product-preserving functors between Grothendieck toposes

Published on 26 Mar 2026 - 11:00

List Question

Example that objects are not all sets in a locally small category

Example that you are tempted to use L'Hopital rule even if the limit does not exist

Closed Subspace of a Banach Space with a Non-closed Linear Complement

If a function $f : A \to B$ is not injective, is it possible that $g \circ f$ is injective?

Is the following argument about L'Hopital's rule correct?

Can someone give me an example of a challenging proof by induction?

Proving H is NOT a subgroup of G given G is NOT abelian

summation equation

Change of measure to make things "easier"?

Normalizer of Normalizer

Looking for counter-intuitive example for independence of random variables

Counter-examples to $x \not \in K \implies \Bbb Q(x) \cap K = \Bbb Q$

Finite-dimensional algebras which do not satisfy Wedderburn's principal theorem

Simplest mixed tensor example

Cocontinuous product-preserving functors between Grothendieck toposes

Trending Questions

Popular # Hahtags

Popular Questions