# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Selecting a subcover by original indices](/en/derivations/derivation-mko-open-cover-and-subcover-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-open-cover-and-subcover)

Audit a supplied open cover of K={a,b} and its subcover indices.

Open cover and subcover

derivation-mko-open-cover-and-subcover-01





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