Newbetuts

Examples of non trivial equivalence relations , I mean equivalence relations without the expression " same ... as" in their definition?

Non-abelian group with infinitely many abelian subgroups

Isomorphic groups but not isomorphic rings

Example of decreasing sequence of sets with first set having infinite measure

Algebra defined by $a^2=a,b^2=b,c^2=c,(a+b+c)^2=a+b+c$

Measurable subset of $\mathbb{R}$ with a specific property

Example of a pair of non-cobordant manifolds

Does Measurablity of Cuts imply Measurability in Product Space?

Other Euler characteristics?

Weak Hausdorff space not KC

Does separability follow from weak-* sequential separability of dual space?

Homorphism with injective and surjective

Continuous and bounded imply uniform continuity?

Primality test for numbers of the form $(3^p-1)/2$

Sigma-algebra requirement 3, closed under countable unions.

Explicit example of a non-trivial zero of Riemann zeta function

New posts in examples-counterexamples

Does a non-abelian semigroup without identity exist?

Right English wording for "counterexamples to a theorem"

Must an injective or surjective map in an infinite dimensional vector space be a bijection?

A binary operation, closed over the reals, that is associative, but not commutative

Examples of non trivial equivalence relations , I mean equivalence relations without the expression " same ... as" in their definition?

Non-abelian group with infinitely many abelian subgroups

Isomorphic groups but not isomorphic rings

Example of decreasing sequence of sets with first set having infinite measure

Algebra defined by $a^2=a,b^2=b,c^2=c,(a+b+c)^2=a+b+c$

Measurable subset of $\mathbb{R}$ with a specific property

Example of a pair of non-cobordant manifolds

Does Measurablity of Cuts imply Measurability in Product Space?

Other Euler characteristics?

Weak Hausdorff space not KC

Does separability follow from weak-* sequential separability of dual space?

Homorphism with injective and surjective

Continuous and bounded imply uniform continuity?

Primality test for numbers of the form $(3^p-1)/2$

Sigma-algebra requirement 3, closed under countable unions.

Explicit example of a non-trivial zero of Riemann zeta function