Congruence lattice problem: Difference between revisions

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'''Theorem.'''
The functor Con<sub>c</sub>, defined on all algebras of a given [[Signature_%28universal_algebra%29signature_(mathematical logic)|signature]], to all (&or;,0)-semilattices, [[Limit (category theory)|preserves direct limits]].<br /><br />
 
== Schmidt's approach via distributive join-homomorphisms ==