Three Laws of Thermodynamics (paraphrased): First Law: You can't get anything without working for it. Second Law: The most you can accomplish by work is to break even. Third Law: You can't break even.
I stumbled across the above joke (from the webmaster's viewpoint, but see jwpat7's comment) and it made me wonder if "paraphrasing an equation" can be used in a more formal context. The construction I have in mind is
First, I consider the relation between mass and energy, which, paraphrasing, says that ...
Is this construct acceptable?
In the second quote, relation stands for mathematical relation in specific reference to an equation. A more accurate example is the following
First, I consider the equation relating mass to energy, which, paraphrasing, says that ...
Bonus question: which or that?