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New posts in semigroups
give a counterexample of monoid
abstract-algebra
group-theory
examples-counterexamples
semigroups
monoid
Does a non-abelian semigroup without identity exist?
abstract-algebra
examples-counterexamples
semigroups
Prove that a semigroup satisfying $a^pb^q=ba$ is commutative
abstract-algebra
group-theory
semigroups
binary-operations
What does $\mathrm{Spec}(\mathbb{Z})\times_{\mathrm{Spec}(\mathbb{F}_{1})}\mathrm{Spec}(\mathbb{Z})$ look like?
abstract-algebra
algebraic-geometry
semigroups
monoid
In a semigroup does left identity and right inverse imply a group?
abstract-algebra
group-theory
semigroups
Group identities and inverses
group-theory
semigroups
Why is a monoid with right identity and left inverse not necessarily a group? [duplicate]
group-theory
examples-counterexamples
semigroups
monoid
Is there a name for an element $z$ such that $\,zx = z = xz\,$ for all $x$?
semigroups
monoid
magma
Free idempotent semigroup with 3 generators
combinatorics
semigroups
universal-algebra
Just How Strong is Associativity?
soft-question
examples-counterexamples
semigroups
magma
associativity
Ring without distributive law?
abstract-algebra
semigroups
How many associative binary operations there are on a finite set?
group-theory
semigroups
Semigroups with no morphisms between them
category-theory
examples-counterexamples
semigroups
Show that $S$ is a group if and only if $aS=S=Sa$.
abstract-algebra
group-theory
semigroups
Is a semigroup with unique right identity and left inverse a group?
group-theory
semigroups
Eilenberg's rational hierarchy of nonrational automata & languages
automata
formal-languages
semigroups
context-free-grammar
Associativity test for a Magma
group-theory
semigroups
associativity
magma
How to get a group from a semigroup
group-theory
semigroups
Describing the Wreath product categorically.
group-theory
category-theory
semigroups
semidirect-product
wreath-product
Dynamical System Cocycles: (Semi)Group vs. Monoid Definitions - Examples When is Distinction Important?
reference-request
dynamical-systems
group-actions
semigroups
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