4 in notes
digit/number: at most (all); no more than.
is less than or equal to x
in property/quantity x
by amount x
mekso operator: power set - produces the set of all subsets of set A that are of (any) size (that is) b [a nonnegative integer or transfinite/infinite number]
digit/number: precise to within the stated sigfigs (significant figures/digits); approximately, measured to be approximately, with some error/rounding
digit/number: exact, exactly equal to, no more and no less, mathematically ideally (no measuring or rounding error)