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15
160
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Which ultrafilters are (sort-of) commutators?

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#general-topology #logic #set-theory #semigroups #universal-algebra
455
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Is there a minimal generating set of reals which additively generate all the reals?

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#abstract-algebra #group-theory #real-numbers #semigroups
49
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Counting Binary Sequences Arising from a Numerical Semigroup

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#sequences-and-series #combinatorics #binary #semigroups
241
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Krohn-Rhodes decomposition for transformations over $\{0,1\}$

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#abstract-algebra #semigroups #wreath-product
73
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Cancellation property of the Stone Cech compactification

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#general-topology #topological-groups #semigroups #compactification #topological-semigroups
90
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Do some authors call a "monoid" a "semigroup"?

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#partial-differential-equations #terminology #semigroups #monoid #semigroup-of-operators
120
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$(ab)^2=a^2b^2$ doesn't hold for semigroup.

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#abstract-algebra #group-theory #abelian-groups #semigroups
65
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Infimums of subsets of monoid.

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#logic #commutative-algebra #supremum-and-infimum #semigroups #monoid
40
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A semigroup with right identity and right inverses is a group.

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#group-theory #solution-verification #semigroups
98
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Regular semigroups -- intuition

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#semigroups #pseudoinverse #generalized-inverse
22
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Compactification of a topological semigroup with right-identity structure

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#topological-groups #semigroups #alexandroff-compactification
18
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Find a compact set $S$ in topological semigroup $T$ with $SK\subseteq (T-K)$ for some compact set $K$

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#semigroups #topological-semigroups
29
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Commutator estimates between a contraction evolution group and a differential operator

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#sobolev-spaces #estimation #semigroups #differential-operators #self-adjoint-operators
72
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Proving a semigroup properties are equivalent

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#abstract-algebra #group-theory #semigroups
125
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Let $S$ be a semigroup. If for any $x,y\in S$, $x^2y=y=yx^2$, then prove that $S$ is an abelian group

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#group-theory #solution-verification #abelian-groups #semigroups

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