"The Pre-persons" is a science fiction short story by Philip K. Dick. It was first published in Fantasy and Science Fiction magazine, October 1974 shortly after the author's mental breakdown in March 1974.
It was a pro-life response to Roe v. Wade. Dick imagines a future where the United States Congress has decided that abortion is legal until the soul enters the body, which is specified as the moment a person has the ability to do simple algebra. The main protester — a former Stanford mathematics major — demands to be taken to the abortion center, since he claims to have forgotten all his algebra.