## Quick Reference

Something which is already known independently, or something which is to be used in the course of a proof. For example the epsilon-data method of proof usually states ‘Given *ε*>0, there exists a *δ*’, by which is meant ‘For any *ε* you choose, no matter how small, I can find a value of *δ* for which…’.

*Subjects:*
Mathematics.

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