Consulting for "A Beautiful Mind" was in part an exercise in mathematical fiction. The later math is imagined to fit the story. John Nash even wrote me to ask what the math on the clipboard meant, as his film self recovered on a porch.
In various venues, I explained that mathematicians don't have a lot of experience writing fiction. Other than grant proposals...
John Nash saw the symbol pi as just a Greek letter. In grad school he proudly used every Greek letter in a paper. I was asked to decorate his (film) dorm window in grease pencil, and by chance a photograph of Russell Crowe through this window became one of the most widely distributed promo stills. He's looking intent behind the equation "0 < pi < 1", straight from Nash's paper.
The reaction in my community, which I quite enjoyed, would disabuse anyone of the idea that mathematicians are less cripplingly conventional than other people. To the majority of mathematicians, pi is tied to the circle. A great UC Berkeley email thread speculated that I was trying to make Russell Crowe look like a fool.
https://m.media-amazon.com/images/I/614cOQl6DwL._AC_SL1000_....