1. The Problem
Let's get started: the factors involved and their relationship:
In our equation we have so many fixed factors, that we end just with a very simple equation: (at a given pitch and string length) gauge=tension*(under squared root and multiplied for a coefficient for gut’s mass).
If we change one of them, the other follows (to maintain the same pitch).
What do we mean by equal feel, equal tension and scaling tension?
There are many factors, in a violin, which interfere with the results of our maths: 
