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प्रश्न
What is a lemma?
उत्तर
A proven statement used as a stepping-stone toward the proof of another statement is called lemma.
For example:
Euclid’s Division Lemma: Let a and b be any two positive integers.
Then, there exist unique integers q and r such that
`a=bq+r `, `0 ≤ r < b`
If `b|a` then `r=0`.
Otherwise, r satisfies the stronger inequality `0 < r< b.`.
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