Both, it depends on the element. Some have two and some have one
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It can represent formulas like A=L×W etc...
French months are not abbreviated in two-letter form. That would be confusing for mars and mai, for example. Months names with four or less letters are not abbreviated at all. The usual abbreviation are: janvier = Janv. février = Fév. mars = mars Avril = Avr. mai = mai juin = Juin juillet = Juil. août = aout septembre = Sept. octobre = Oct. novembre = Nov. décembre = Déc.
Each number in a matrix is called an element.
It is a 'term'
You integrate each element of the matrix.