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by contradiction (доказательство: To prove something by contradiction, we assume that what we want to prove is not true, and then show that the consequences of this are not possible. That is, the consequences contradict either what we have just assumed, or something we already know to be true (or, indeed, both) – we call this a contradiction.  maths.org); by contradiction (proof by contradiction – доказательство от противного) | |||
| ex adverso (доказательство); ex contrario (доказательство) | |||
| a contrario (Latin for "on the contrary") | |||
| от противного: 34 phrases in 12 subjects |
| Aviation medicine | 1 |
| Business | 1 |
| Electronics | 1 |
| General | 4 |
| Law | 5 |
| Logic | 4 |
| Makarov | 3 |
| Mass media | 1 |
| Mathematics | 10 |
| Physics | 1 |
| Programming | 1 |
| Technology | 2 |