use postulated in a sentence.
Leta Hollingworth first introduced the concept; she postulated a 'communication range' of around 30 IQ points, beyond which, the impedance mismatch would make it difficult to build friendships.
Tesla postulated that there are faster speeds than light-speed...
Also the "deep internet" is frequently postulated to be "huge" by "people".
Dark matter and dark energy are postulated as such an explanation.