The variation may be represented in terms of a derivative.
β Structure and Interpretation of Classical Mechanics
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A lambda expression evaluates to a procedure. The environment in effect when the lambda expression is evaluated is remembered as part of the procedure; it is called the closing environment.
β Structure and Interpretation of Classical Mechanics
(define (((delta eta) f) q) (let ((g (lambda (epsilon) (f (+ q (* epsilon eta)))))) ((D g) 0)))
— Me@2019-05-05 10:47:46 PM
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2019.05.05 Sunday (c) All rights reserved by ACHK