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впустую
теоре́ма

theorem [ˈθɪərəm, Am ˈθi:ɚəm] N mat

theorem
Pythagoras' theorem

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Examples from the PONS Dictionary (editorially verified)

Monolingual examples (not verified by PONS Editors)

For some time it was thought that certain theorems, like the prime number theorem, could only be proved using higher mathematics.
en.wikipedia.org
We claim that without loss of generality, the latter inequality is always strict; once we do this the theorem can be proved as follows.
en.wikipedia.org
From 1996, the scope broadened to cover all theorem proving in higher-order logics.
en.wikipedia.org
He is also credited with the use of fat symbols for matrices, making easy the derivation of several theorems of quantum mechanics.
en.wikipedia.org
This relationship is called the parallel axis theorem.
en.wikipedia.org