Japanese
Definition of
"Compound Proportional Relation"
A compound propotional function among quantities Q1, Q2, Q3 is a function
f : Q1 x Q2 ---> Q3
f(q1 x n, q1)
= f(q1, q1 x n)
= f(q1, q1) x n
for any elements q1 of Q1, q2 of Q2, and any number n.