I have a very long formula. There are variables R1, and R. Every time when I change the value of R. like R=1, and R1 also change to 11. Is there any way to make R and R1 be two completely individual variables? Thanks!
This problem is addressed by the Notation package, and in particular by its function Symbolize. Have a look at the Notation/tutorial/NotationSymbolizeAndInfixNotation tutorial.