About phi.fyi

Who publishes it

phi.fyi is published by Vexidus Corporation, a holding company in aerospace and defense manufacturing, supply-chain software and security.

How it is written

• The mathematics is stated exactly, with sources a reader can open.
• Claims about art, architecture and nature are included only where they hold up, or to say plainly that they don't.
• The page is dated. The date at its foot shows when it was last reviewed.

Contact and corrections

Corrections and suggestions can be sent through Vexidus Corporation's contact page.