Learn Turkish: Tarihî belgeyi okuduktan sonra, kimse bu rivayete inanmış olamaz. - After reading the historical document, no one could have believed this rumor.

This is the negative epistemic past deduction form. We use the past participle inanmış (believed) followed by olamaz, which is the negative ability form of olmak (cannot be). Together, they literally mean 'cannot be in the state of having believed,' which translates to 'cannot have believed' or 'could not have believed'.

Why is there a circumflex on the last letter of Tarihî?

The circumflex (şapka) is used here to show the relational 'i', meaning 'related to history' or 'historical.' Without it, tarihi could be confused with 'its history' (possessive) or 'the history' (accusative). Keeping it clarifies that the word is acting as an adjective modifying belgeyi.

Why is rivayete in the dative case here?

In Turkish, the verb inanmak (to believe) always takes the dative case for the object being believed. You direct your belief 'to' something. That is why bu rivayet (this rumor) becomes bu rivayete.

Does kimse (nobody) require the verb to be negative?

Yes! Unlike standard English where 'nobody' pairs with a positive verb (e.g., 'Nobody knows'), Turkish requires negative concord. Words like kimse must be paired with a grammatically negative verb. Here, the negative suffix -maz in olamaz provides that required negation.