it is not unreasonable to pause for a moment and think about how tat'yana andreevna, with no mathematical training or knowledge, made by her determination and extreme efforts a major contribution to mathematics by allowing pontryagin to become a mathematician against all the odds.

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It is not unreasonable to pause for a moment and think about how Tat'yana Andreevna, with no mathematical training or knowledge, made by her determination and extreme efforts a major contribution to mathematics by allowing Pontryagin to become a mathematician against all the odds.