Translation of "theory" into Swahili

How does the prevalence of altruistic feelings relate to the theory of evolution?

Hisia za kuwajali wengine zinahusiana jinsi gani na nadharia ya mageuzi?

The theory regarding a second Isaiah—or Deutero-Isaiah—gave birth to the notion that a third writer may have been involved.

Fikira ya kwamba kulikuwa na Isaya wa pili ilianzisha wazo la kwamba huenda ikawa kulikuwa na mwandishi wa tatu.

He is viewed by many as the founder of the probability theory,

Anajulikana na wengi kama mwanzilishi wa kanuni ya uwezekano wa kitu fulani kutokea