Delta V cheatsheet

[Markhoz]

So i was reading about delta V and the various formulas, like:

So i was wondering about what l_n​ stands for? Anyone can help me?

[LexiSilva]

ln is the 'natural logarithm'. It is a beautiful number in maths, but there is an ln button on most scientific calculators

[*Aqua*]

ln? Logarithmus naturalis (logarithm with base e; e = 2.718...).

[Markhoz]

thank u all