x_{1} (li) is the size of set x_{2} by standard/notion x_{3}

x_{3} may be cardinality, measure in a given space, various forms of density, etc. Many notions exist.

- umre
- x
_{1}(set) is measurable and has measure x_{2}(li; non-negative real number or possibly positive infinity) by measure x_{3}in space/dimensionality/under conditions x_{4}; x_{2}is the x_{3}measure of set x_{1}in space x_{4}; x_{3}is a measure which is defined on some class of measurable sets in x_{4}such that it maps x_{1}to x_{2}