su'i VUhU1 cmavo

n-ary mathematical operator: plus; addition operator; [(((a + b) + c) + ...)].

See also vu'u, sumji

On affix form:

sumti
x1 is a/the argument of predicate/function x2 filling place x3 (kind/number).

In notes:

sumji
x1 is a mathematical sum/result/total of x2 plus/increased by x3.
vu'u
n-ary mathematical operator: minus; subtraction operator; [(((a - b) - c) - ...)].
bai'ei (exp!)
unary mathematical operator: successor/augment/increment (by one), succ(a) = a++ = a+1
boi'e'u
mekso operator/function terminator (in Polish notation): inserts exactly enough "{boi}"'s consecutively so as to terminate the most recently uttered operator/function in a mekso expression
sau'i (exp!)
mekso n-ary operator: reciprocal of the sum of the reciprocal of each of X1, X2, ..., Xn (for any natural number n); 1/((1/X1) + (1/X.
xau'e
symbol string to number/variable