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                        Arithmetic

                        Reading time: 1min

                        Checks if a progression is arithmetic or not. An arithmetic series is the sum of a sequence in which each term is computed from the previous one by adding (or subtracting) a constant d:

                        ak=ak-1+d=...=a1+d(k-1)

                        Syntax

                        arithmetic?(Progression)
                        
                        arithmetic?(Expression, Identifier)
                        

                        Description

                        Given a progression, returns a list. If the progression is not arithmetic, the list just contains an element: false. Else, the list has two elements: true and the value d, following the notation above.

                        Given the expression of the general term and the variable, returns a list. If the progression given by the expression is not arithmetic, the list just contains an element: false. Else, the list has two elements: true and the value d, following the notation above.

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