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Theorem

Proof That e Is Irrational

Number Theory

The number e was introduced by Jacob Bernoulli in 1683. More than half a century later, Leonhard Euler, who had studied under Jacob Bernoulli's younger brother Johann, proved that e is irrational, meaning it cannot be expressed as the quotient of two integers.

Facts
Statement
The number e cannot be expressed as the quotient of two integers, that is, e is irrational. 1
Proof Year
1737 1
Classification
Statement Form
Characterization Theorem 1
Connections

Has Statement Form

Entity-backed identity for the statement-form enum value this theorem already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The statement-form fact itself stays on the theorem unchanged.

Sources
1. Proof that e is irrational, Wikipedia
  • Introduction section
    proved that e is irrational; that is, that it cannot be expressed as the quotient of two integers.
  • Euler's proof section
    Euler wrote the first proof of the fact that e is irrational in 1737 (but the text was only published seven years later).
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