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15
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Is $*$ associative?

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#semigroups #binary-operations #associativity
42
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Characters on inverse semigroups: Hahn-Banach?

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#abstract-algebra #order-theory #boolean-algebra #semigroups #inverse-semigroups
121
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$eSe$ in a finite semigroup

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#abstract-algebra #semigroups
211
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Prove that a semigroup $(S, +)$ is a group if and only if the only ideal of $S$ is $S$ itself.

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#group-theory #semigroups
260
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Ordered semigroup with an absorbing element

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#abstract-algebra #ring-theory #order-theory #semigroups #universal-algebra
80
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Comparability with zero of an ordered semigroup

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#abstract-algebra #order-theory #semigroups
92
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Comparability with identity of an ordered semigroup

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#abstract-algebra #group-theory #order-theory #semigroups #monoid
84
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What does it mean for a category to have a semi-automorphism?

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#category-theory #terminology #semigroups #morphism
192
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Prove or disprove: $A$ is a subgroup of $G$ if and only if $AA=A$.

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#abstract-algebra #group-theory #examples-counterexamples #semigroups
74
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What is the smallest multiplication table of inverse semigroup without identity?

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#semigroups #finite-semigroups
607
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What is the difference between quasigroup with associativity and semigroup with inverse?

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#group-theory #inverse #semigroups #quasigroups
53
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The Fundamental Semigroups of a Topological Object?

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#abstract-algebra #general-topology #geometric-topology #semigroups
294
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Does this particular axiom on a semigroup guarantee that it is a group?

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#abstract-algebra #group-theory #semigroups #binary-operations
70
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Question on a proof involving linked pairs and Green's relations. Characterisation of conjugacy of linked pairs

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#abstract-algebra #formal-languages #semigroups
75
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Show that the $H$-class from Green's relations contains the product of two of its elements

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#abstract-algebra #semigroups #monoid

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