List append collect column combinations combinations combinations_with_repetition constrained_maximum constrained_maximum constrained_minimum constrained_minimum coplanars? correlation_n count_element curve2d diagonal_matrix diagram divisor elements equation erase geometric_progression head index_erase insert interpolate inverse lengths linearly_independents? matrix max min moment multiplicity numerical_solve permutation permutations permutations_with_repetition plane point prepend progression quadric quadric3d range relation replace resultant resultant_matrix reverse_range roots_to_polynomial select set solve sort standard_deviation_n substring table tail take to_decimal variance_n variations variations_with_repetition zero?