quod erat demonstrandum

So, never mind what such persons say, my sweetest, because they know nothing at all—quod erat demonstrandum.

Their death is merely the quod erat demonstrandum of a mathematical and mechanical proposition.

Quod erat demonstrandum—if one may be permitted to apply scholastic formulae to the science of manners.

It did at first, but inside of a week I wrote the Quod erat demonstrandum on it.

Therefore men were originally fish, quod erat demonstrandum.