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

- sumti
- x
_{1}is a/the argument of predicate/function x_{2}filling place x_{3}(kind/number).

- sumji
- x
_{1}is a mathematical sum/result/total of x_{2}plus/increased by x_{3}. - 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
*(exp!)* - 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 X
_{1}, X_{2}, ..., X_{n}(for any natural number n); 1/((1/X_{1) + (1/X}. - xau'e
- symbol string to number/variable