klenilbra lujvo

x1 (li) is the size of set x2 by standard/notion x3

x3 may be cardinality, measure in a given space, various forms of density, etc. Many notions exist.

In notes:

umre
x1 (set) is measurable and has measure x2 (li; non-negative real number or possibly positive infinity) by measure x3 in space/dimensionality/under conditions x4; x2 is the x3 measure of set x1 in space x4; x3 is a measure which is defined on some class of measurable sets in x4 such that it maps x1 to x2