open cover

noun

, Mathematics.

1. a cover of a set consisting entirely of open sets.

Example Sentences

This will be equally good the next day, if kept in a cool place, with an open cover, which prevents all danger of souring.

From Project Gutenberg

By keeping just in their rear we might be able to urge them gently along until they should enter more open cover.

From Project Gutenberg

Place the book flat upon the table, the front cover open, take book of similar thickness and place under open cover.

From Project Gutenberg