olemus
mõõduruumi mõõtuv hulk, mille mõõt on null
= a measurable set of measure space that has measure zero

ülevaateid
https://www.quora.com/What-is-difference-between-empty-set-and-null-set

https://en.wikipedia.org/wiki/Null_set

http://www.malayajournal.org/articles/MJM109.pdf

vt ka
- tühi hulk