(calculus) A differential operator which acts on a differential k-form to yield a differential (k+1)-form, unless the k-form is a pseudoscalar, in which case it yields 0.

plural of quasi-derivative

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(mathematics) A particular generalization of the derivative of a function between two Banach spaces.

plural of logarithmic derivative

(calculus, mathematical analysis) Given a real or complex function f, the ratio of the value of the derivative to the value of the function, (f')/f, regarded as a function.

(algebra) With respect to a Boolean variable x_i: The XOR-sum of the positive and negative Shannon cofactors of the given derived function with respect to x_i. In symbols: ∂f/∂x_i(⃑x)=f_x_i(⃑x)⊕f_̄x_i(⃑x).

plural of derivative work

(law) In copyright law, a work that is a variation of an original work sufficiently similar to contain protected elements of the original work, but sufficiently different to qualify for copyright protection independent of the original work.

(singular only) A particular operator that, when applied to a function f yields a function x↦(f(x))/(f'(x))-3/2((f(x))/(f'(x)))² / (countable) Any image of that operator.