A proof shows that 4/n equals a sum of three unit fractions for n ≥ 2, suggesting new mathematical insights.
Preprint v1 — A proof that 4/n can be expressed as a sum of three unit fractions for every n ≥ 2. Abstract redacted pending IP review. Full abstract and unrestricted access will be available in v2 upon completion of intellectual property proceedings.
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Joseph R. Keen (2026) studied this question.
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