Prove that the system $\vartheta $ of all finite unions of the form $\bigcup_{i=1}^{n}\left [a_{i},b_{i} \right )$ together with the empty set is a ring.
Can anyone help me, how to prove it?
2026-05-17 02:53:43.1778986423
Prove that the system $\vartheta $ is a ring.
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