Wick's theorem
plural of polar
(figuratively) Trying to achieve a particular task, often with difficulty. / (figuratively) Lost. / (figuratively) Having lost one's mind; insane.
(quantum mechanics) A method of reducing high-order derivatives to a combinatorics problem, used extensively in quantum field theory to reduce arbitrary products of creation and annihilation operators to sums of products of pairs of these operators.
Initialism of credit note. / construction number (aircraft construction).
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