(obsolete or rare) Covariance.

A legal requirement to achieve an impossible proof. Remedies are reversing the burden of proof, or giving additional rights to the individual faced with this requirement.

(logic) A proof showing that if an assumption A is true then a consequent statement or conclusion B must also be true, i.e. B is true on the condition that A is true.

An item of cosmetics; a material or device for the purpose of enhancing physical attractiveness.

(topology) A method of adjoining a chain of degree p with a cochain of degree q, such that q ≤ p, to form a composite chain of degree p − q.

plural of protein shake

A beverage containing protein mixed with milk or water for the purposes of improved nutrition, especially in bodybuilding.

A kind of puzzle in which there is one common factor in a first set of diagrams that is missing from a second set. The solver (possibly a computer program) must identify this factor.

Alternative form of measurement problem

(quantum mechanics) The unresolved problem of what causes a wavefunction to collapse into an eigenstate, or whether wavefunctions collapse at all.