Could someone please tell me how I put a number to an array of equations? I have been able to number only each of them.
I use the math display environment and put inside a table for the equations, in this way you can ask the math environment to have a number which will refer to all the equations.
Although one has probably to work a bit on the spacings.
We should really have some standard macro to do that. At least some basic constructions for math.