The operand structures specify what various operands (labeled a, b, c, ...) mean. The implied context is forethought, since only forethought operators can have a variable number of operands; however, the same rules apply to infix and RP uses of VUhU.
su'i plus (((a + b) + c) + ...)
pi'i times (((a × b) × c) × ...)
vu'u minus (((a − b) − c) − ...)
fe'i divided by (((a / b) / c) / ...)
ju'u number base numeral string “a” interpreted in the base b
pa'i ratio the ratio of a to b, a:b
fa'i reciprocal of/multiplicative inverse 1 / a
gei scientific notation b × (c [default 10] to the a power)
ge'a null operator (no operands)
de'o logarithm log a to base b (default 10 or e as appropriate)
te'a to the power/exponential a to the b power
fe'a nth root of/inverse power bth root of a (default square root: b = 2)
cu'a absolute value/norm | a |
ne'o factorial a!
pi'a matrix row vector combiner (all operands are row vectors)
sa'i matrix column vector combiner (all operands are column vectors)
ri'o integral integral of a with respect to b over range c
sa'o derivative derivative of a with respect to b of degree c (default 1)
fu'u non-specific operator (variable)
si'i sigma (Σ) summation summation of a using variable b over range c
va'a negation of/additive inverse -a
re'a matrix transpose/dual a*