Hola Julián. Hovering over an expression shows the result that SMath stores. So, this is the value of Ma, which depends on Re, which is defined later.

So this is what is stored in Ma(x).

Apparently there would be some kind of recurrence since Ma(x) depends on Ma, which depends on Re and Re depends on Ray and ... well, I don't see the problem with recurrence, but SMath evidently has some kind of problem, which I don't know what it could be, but I guess that there is some "unstable" recurrence there.
If you define Ma
after Re, the problems would be solved:


calculation error smath mab 2.sm (192 KiB) downloaded 60 time(s).Best regards.
Alvaro.