Interval (matematika): Béda antarrépisi

The addition and multiplication operations are [[commutative]], [[associative]] and sub-[[distributive]]: the set ''X'' ( ''Y'' + ''Z'' ) is a subset of ''XY'' + ''XZ''.
 
==Notasi alternatip==
==Alternative notation==
Cara sejen keur nuliskeun interval, ilaharna katempo di [[France]] sarta sababarha nagara Eropa sejenn, nyaeta:
An alternative way of writing intervals, commonly seen in [[France]] and some other European countries, is shown below:
 
* ]''a'',''b''[ = { ''x'' | ''a'' < ''x'' < ''b'' }
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