- quod erat demonstrandum, Quod erat demonstrandum (Latin what had to be proved or what was to be demonstrated).
- quantum electrodynamics
- French: CQFD (ce qu'il fallait démontrer)
- German: w.z.b.w. (was zu beweisen war)
- Italian: C.V.D. (come volevasi dimostrare)
- Spanish: C.Q.D. (como queríamos demostrar)
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