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Natural logarithm

On a Microsoft calculator you can calculate natural logarithms with the key

ln

 


Example 1

To calculate ln (1) = 0

 1  ln 0

and you can calculate this also as

Inv ex 1 ln 0

because there is always a 0 on an empty display, so you see here ln (e0) = ln (1) = 0.

 


Example 2

To calculate ln (e) = 1

 1  Inv ex ln 2

 


Example 3

To calculate ln (e2) = 2

 2  Inv ex ln 2

 


Example 4

To calculate eln (7) = 7

 7  ln    1.9459101490553133051053527434432 Inv ex 7

and this shows the definition of the logarithm.

 


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