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New posts in examples-counterexamples
Nasty examples for different classes of functions
real-analysis
intuition
examples-counterexamples
Topologist's Sine Curve not a regular submanifold of $\mathbb{R^2}$?
general-topology
manifolds
examples-counterexamples
Natural uses for the co-product of sets?
elementary-set-theory
soft-question
category-theory
examples-counterexamples
education
Is $2^{\aleph_0} = \aleph_1$?
set-theory
examples-counterexamples
cardinals
An Example of a Nested Decreasing Sequence of Bounded Closed Sets with Empty Intersection
real-analysis
metric-spaces
examples-counterexamples
Does There exist a continuous bijection $\mathbb{Q}\to \mathbb{Q}\times \mathbb{Q}$?
real-analysis
general-topology
examples-counterexamples
Definition of the normalizer of a subgroup [duplicate]
group-theory
examples-counterexamples
Tensor product of injective ring homomorphisms
algebraic-geometry
commutative-algebra
examples-counterexamples
affine-schemes
Continuous partials at a point without being defined throughout a neighborhood and not differentiable there?
real-analysis
analysis
multivariable-calculus
examples-counterexamples
Example of a rational function such that : $(f(x))^{3} + (g(x))^{3} + (h(x))^{3}=x$
number-theory
functions
examples-counterexamples
Example of a Bounded Linear Operator with Unbounded Spectrum.
functional-analysis
operator-theory
examples-counterexamples
normed-spaces
spectral-theory
Ring and Subring with different Identities [duplicate]
abstract-algebra
ring-theory
examples-counterexamples
The homotopy category of complexes
category-theory
examples-counterexamples
homological-algebra
homotopy-theory
abelian-categories
Multiplying convergent and divergent sequences
real-analysis
sequences-and-series
examples-counterexamples
Subspaces of $\ell^{2}$ and $\ell^{\infty}$ which are not closed?
general-topology
functional-analysis
examples-counterexamples
lp-spaces
Basic Example of Yoneda Lemma?
category-theory
examples-counterexamples
yoneda-lemma
Counterexample to second derivative test when f''(x) is not continuously differentiable
calculus
real-analysis
examples-counterexamples
Lower Semicontinuity Concepts
general-topology
functional-analysis
banach-spaces
examples-counterexamples
semicontinuous-functions
Example: satisfying $E(X_{n+1}\mid X_n)=X_n$ but not a martingale
probability-theory
examples-counterexamples
martingales
A comparison between the fundamental groupoid and the fundamental group
general-topology
algebraic-topology
examples-counterexamples
groupoids
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