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$a = e^{l n (a)}$

Uttrycket

e^{l n (a)}

kan förenklas till a, men detta gäller även åt andra hållet. Ett tal kan alltså skrivas som e upphöjt till en naturlig logaritm, t.ex.

Denna regel gäller för alla positiva tal a. Man kan säga att "e upphöjt till" och "

ln

" tar ut varandra.

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