I see your point with abstract expressions, but the connection I'm failing to make is - if they are completely abstract, then how can the equation be related to the physical world?
In essence, the equation defines the relations between some values - but if any or some of the values can be replaced by real measurements, then surely the relations between real measurements are not interchangeable?
I see your point with abstract expressions, but the connection I'm failing to make is - if they are completely abstract, then how can the equation be related to the physical world?
In essence, the equation defines the relations between some values - but if any or some of the values can be replaced by real measurements, then surely the relations between real measurements are not interchangeable?