Does matematicas have a plural form

Question

Do matematicas and lunes have plural forms

Just edited your grammar a little bit. - Nathaniel, Jul 16, 2010

Answer 1

las matemáticas is a plural noun. It will always be las.

However, there is a noun form

matemática

Notice the notation in the dictionary entry:

U. m. en pl. con el mismo significado que en sing.

el lunes, los lunes only the articles change.