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#' Arithmetic Operators
#'
#' These unary and binary operators perform arithmetical operations on polynomial or numerical marices.
#'
#' @param e1,e2 first and second operands
#'
#' @details
#' Both operands can be:
#' * numerical scalar
#' * polynomial scalar
#' * numerical matrix
#' * polynomial matrix
#'
#' @name polyMatrix-Arith
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