Abstract
Abstract Partially ordered fuzzy algebras are mappings from an algebra to a partially ordered set, with the property that every level subset is an ordinary subalgebra. Similar definitions are induced for P -valued congruences and weak congruences. Necessary and sufficient conditions under which an arbitrary collection of subalgebras (congruences) enables construction of a P -valued fuzzy subalgebra (congruence) are given. Any P -valued weak congruence uniquely determines a P -valued subalgebra of the same algebra. Finally, any collection of subalgebras or congruences of a given algebra can be used for the construction of a relational valued fuzzy algebra or congruence. This seems to be the most general way to obtain a fuzzy algebra (congruence) out of the collection of the ordinary subalgebras (congruences).
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