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Queen's Counsel; Queen's College. q.d., quasi dicat=As if he should say. q.e., quod est=Which is. q.e.d., quod erat demonstrandum=Which was to be demonstrated. q.e.f., quod erat faciendum=Which was to be done. q.e.i, quod erat inveniendum=Which was to be found out. q.l., quantum libet=As much as you please.

Q.E.F., quod erat faciendum, which was to be done.

The business in hand, however, is not a theorem, but a problem; it is not a thesis to be proved, but a malady to be cured; and the world will thank only the reasoner who winds up, not with Q.E.D., but with Q.E.F.