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Finite equational basis for trigonometric identities

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#trigonometry #model-theory #universal-algebra
133
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When "is" a congruence an object?

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#category-theory #universal-algebra
50
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Quotienting kills the subgroups lattice below an element; what kills upwards?

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#group-theory #universal-algebra
197
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Model Theory: Group Substructures

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#group-theory #model-theory #universal-algebra
80
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Why my μ can not be composed in the T-program (Kleisili) category when define Lawvere theory?

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#category-theory #universal-algebra
204
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Models of a certain (weird) equational theory

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#abstract-algebra #binary-operations #universal-algebra #idempotents
467
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Does the forgetful functor $U: \mathbf{Gph} \to \mathbf{Set}$ have a left adjoint?

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#category-theory #universal-algebra #adjoint-functors #relation-algebra
130
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The defintion of Class of algebras

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#definition #universal-algebra
761
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Finite distributive lattices and their poset of join irreducible elements.

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#model-theory #lattice-orders #universal-algebra
57
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Name of this equational theory?

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#abstract-algebra #logic #universal-algebra
548
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Algebraic closed set systems are closed under unions of chains

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#order-theory #universal-algebra
554
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The Proof of Birkhoff's Theorem

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#proof-explanation #universal-algebra
163
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Characterization of the algebraic closure operator generating subuniverses

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#model-theory #universal-algebra
69
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Are there two different binary operations on a set with at least two elements that do not enmesh?

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#universal-algebra
58
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Principal congruences defined by terms

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#model-theory #universal-algebra #congruence-relations

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