U

u(alfa) operator
    SPDE package, 3811
U(ALFA,I) operator
    SPDE package, 3812
Unary prefix operator, 3813
union operator
    ASSIST package, 3814
    SETS package, 3815
unit operator
    PHYSOP package, 3816
unitmatrix command
    ASSIST package, 3817
unmixedradical operator
    CALI package, 3818
unmixedradical!* symbolic procedure
    CALI package, 3819
unrtr command, 3820
unrtrst command, 3821
Unset Statement, 3822
unset statement, 3823, 3824
until, 3825
untrrl command, 3826
untrrlid command, 3827
up_qratio operator
    QSUM package, 3828
upper_matrix switch, 3829
upward_antidifference, 3830
User packages, 3831