This is the 15012th most frequent Russian word.
подтверждением
"Подтверждением" means "confirmation" or "validation" in English.
In this sentence, 'подтверждением' is used in the instrumental case, derived from the noun 'подтверждение'. It represents the means by which something is confirmed.
Его письмо служит подтверждением наших догадок.
His letter serves as a confirmation of our assumptions.
Here, 'подтверждения' is in the genitive case, used to express the lack of confirmation, indicating necessity.
Без подтверждения мы не сможем продолжить процесс.
Without confirmation, we cannot proceed with the process.
In this case, 'в подтверждение' shows the purpose of the action, using the accusative case of the noun 'подтверждение' with the preposition 'в'.