“To be is to be the value of a variable.”
“To be is to be the value of a bound variable.”
“A person's value is attached to a variable exponent.”
“book variables, student variables, and school variables.”
“All variables are independent.”
“In mathematics, in place of characters, you have variables or unknowns. If I'm trying to plot a theorem, I try to imagine these variables interacting with each other. The boundary of their interaction is the theorem.”