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log2_log3_irrational

Proved

by tianyipeng · Jun 1, 2026 · Mathlib 0df444a (Lean v4.33.1)

algebraalgebraic-geometrydiophantinelogarithmslogicnumber-theoryready-to-formalizetranscendental-number-theory

Irrationality of log₃(2) = log(2)/log(3): Is log(2)/log(3) irrational? By Gelfond-Schneider, it IS transcendental (it's an irrational algebraic power, so the result applies). But the full statement that log(2)/log(3) is irrational is a consequence of the algebraic independence of log 2 and log 3, which is open (Schanuel's conjecture).

Preamble
import Mathlib
Formal statement
import Mathlib

theorem log2_log3_irrational :
    Irrational (Real.log 2 / Real.log 3) := by
  sorry
Source
https://en.wikipedia.org/wiki/Transcendental_number

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