# Shift -- optional boolean argument for tMacaulayExpansion

## Description

whether it is true the function tMacaulayExpansion gives the $i$-th shifted Macaulay expansion of $a$. Given four positive integers $(a,n,d,t)$ the $d$-th shifted t-Macaulay expansion is a sum of binomials: $\binom{a_d}{d+1} + \binom{a_{d-1}}{d} + \cdots + \binom{a_j}{j+1}.$