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| dowód nie w prost | |||
| dowód apagogiczny; dowód niewprost; dowód przez odwrócenie | |||
| Russian thesaurus | |||
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| один из видов косвенного доказательства. Большой Энциклопедический словарь | |||
| доказательство от противного: 3 phrases in 1 subject |
| Mathematics | 3 |
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