# OCME · Knowledge & practice explorer

302 MKO / 1,441 families / 360 batches / 36,000 questions.

36,000 second-context math/bilingual reviewed; 0 display/symbol-checked candidates. Source questions: candidate. English: ai_candidate. No new proof, Lean, SREG or training.

1 results; page 1/1.

## Question 20344: A Smaller Domain Does Not Generally Decide the Given Map Is Injective

- ID: `q-20261014-advance-20261107-r05-pigeonhole-principle-0094`; number: 20344
- Processing: second_context_reviewed
- MKO: [mko-pigeonhole-principle](/en/mko/mko-pigeonhole-principle/)
- Family: [qf-mod38-pigeon-converse-boundary](/en/explore/?family=qf-mod38-pigeon-converse-boundary)
- Batch: [batch-20261014-advance-20261107-r05-pigeonhole-principle-foundations](/en/explore/?batch=batch-20261014-advance-20261107-r05-pigeonhole-principle-foundations)
- [Derivation](/en/questions/q-20261014-advance-20261107-r05-pigeonhole-principle-0094/) / [Markdown](/en/questions/q-20261014-advance-20261107-r05-pigeonhole-principle-0094/index.md) / [JSON](/data/question-derivations/questions/q-20261014-advance-20261107-r05-pigeonhole-principle-0094.json)