On grammatical class:

di'ei'o'au
mathematical ternary operator: Dirichlet convolution (a×b)(c)
fa'ai
mathematical ordered n-ary operator: (pointwise) functional left composition; °
fa'au
mathematical unary operator: map notation
ma'o'e
mathematical operator: vague/elliptical/general/generic operator
pi'ei'au
mathematical ternary operator: not-greater-prime-counting function
pi'ei'oi
mathematical ternary operator: prime-generating function
se'au
mathematical quinary operator: left sequence notation/converter
se'i'a'o
unary mathematical operator: identity function id(a) = a
to'ei'au
binary mathematical operator: Jordan totient function Ja(b)
vo'au'u
quaternary mathematical operator: (left) convolution (a★b)(c) in structure d
zi'a'o
mathematical operator: the empty/null [one sense]/trivial [one sense]/blank operator
cu'a
unary mathematical operator: absolute value/norm |a|.
de'o
binary mathematical operator: logarithm; [log/ln a to base b]; default base 10 or e.
fa'i
unary mathematical operator: reciprocal; multiplicative inverse; [1/a].
fe'a
binary mathematical operator: nth root of; inverse power [a to the 1/b power].
fe'i
n-ary mathematical operator: divided by; division operator; [(((a / b) / c) / ...)].
fu'u
n-ary mathematical operator: elliptical/unspecified mathematical expression (mex) operator.
ge'a
mathematical operator: null mathematical expression (mex) operator (used in >2-ary ops).
gei
trinary mathematical operator: order of magnitude/value/base; [b * (c to the a power)].
ju'u
binary mathematical operator: number base; [a interpreted in the base b].
ne'o
unary mathematical operator: factorial; a!.
pa'i
binary mathematical operator: ratio; [the ratio of a to b].
pi'a
n-ary mathematical operator: operands are vectors to be treated as matrix rows.
pi'i
n-ary mathematical operator: times; multiplication operator; [(((a * b) * c) * ...)].
re'a
unary mathematical operator: matrix transpose/dual; A*.
ri'o
trinary mathematical operator: [integral of a with respect to b over range c].
sa'i
n-ary mathematical operator: operands are vectors to be treated as matrix columns.
sa'o
trinary mathematical operator: [derivative of a with respect to b of degree c].
si'i
trinary mathematical operator: [sigma summation of a using variable b over range c].
su'i
n-ary mathematical operator: plus; addition operator; [(((a + b) + c) + ...)].
te'a
binary mathematical operator: to the power; exponential; [a to the b power].
va'a
unary mathematical operator: additive inverse; [- a].
vu'u
n-ary mathematical operator: minus; subtraction operator; [(((a - b) - c) - ...)].
bai'ei
unary mathematical operator: successor/augment/increment (by one), succ(a) = a++ = a+1
gu'ai
binary operator: left group action g.x
jau'au
unary mathematical operator: length/components of formal string in some base/basis; number of digits/components/entries
ne'oi
unary operator: primorial a#
ru'ei
n-ary operator: n-ary magma/group/ring operator a*b = ab`

In definition:

cmavrvu'u
x1 is the selma'o "VUhU".