## See also

Countable Additivity Probability Axiom,

Countable Subadditivity,

Disjoint Union,

Finite
Additivity,

Set Function
*This entry contributed by Christopher
Stover*

## Explore with Wolfram|Alpha

## References

Royden, H. L. and Fitzpatrick, P. M. *Real
Analysis.* Pearson, 2010.
## Cite this as:

Stover, Christopher. "Countable Additivity." From *MathWorld*--A Wolfram Web Resource, created by Eric
W. Weisstein. https://mathworld.wolfram.com/CountableAdditivity.html

## Subject classifications