const math.Ln2

5 uses

	math (current package)
		acosh.go#L59: 		return Log(x) + Ln2 // x > 2**28
		const.go#L21: 	Ln2    = 0.693147180559945309417232121458176568075500134360255254120680009 // https://oeis.org/A002162
		const.go#L22: 	Log2E  = 1 / Ln2
		erfinv.go#L100: 		r := Sqrt(Ln2 - Log(1.0-x))
		log10.go#L36: 	return Log(frac)*(1/Ln2) + float64(exp)

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