exponential function
type: Concept
preferred label: تابع نمایی @fa
related: Plank formula

pi number
type: Concept
preferred label: عدد پی @fa
related: Plank formula

Plank formula
type: Concept
broader: quantum theory
preferred label: فرمول پلانک @fa
related: pi number
related: exponential function

quantum theory
type: Concept
narrower: Plank formula
preferred label: نظریه کوانتومی @fa