U

u(alfa) operator
    SPDE package, 3786
U(ALFA,I) operator
    SPDE package, 3787
Unary prefix operator, 3788
union operator
    ASSIST package, 3789
    SETS package, 3790
unit operator
    PHYSOP package, 3791
unitmatrix command
    ASSIST package, 3792
unmixedradical operator
    CALI package, 3793
unmixedradical!* symbolic procedure
    CALI package, 3794
unrtr command, 3795
unrtrst command, 3796
Unset Statement, 3797
unset statement, 3798, 3799
until, 3800
untrrl command, 3801
untrrlid command, 3802
up_qratio operator
    QSUM package, 3803
upper_matrix switch, 3804
upward_antidifference, 3805
User packages, 3806