Derivation in differential algebra, a unary function satisfying the Leibniz product law
Formal proof or derivation, a sequence of sentences each of which is an axiom or follows from the preceding sentences in the sequence by a rule of inference
Parse tree or concrete syntax tree, a tree that represents the syntactic structure of a string according to some formal grammar
The creation of a derived row, in the twelve-tone musical technique
An after-the-fact justification for an action, in the work of sociologist Vilfredo Pareto
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