regrettably I have forgotten (or never knew) the proof but it is on Wikipedia
https://en.wikipedia.org/wiki/Log-normal_distribution
I suspect that it is some fairly low-grade integral/substitution trick
regrettably I have forgotten (or never knew) the proof but it is on Wikipedia
https://en.wikipedia.org/wiki/Log-normal_distribution
I suspect that it is some fairly low-grade integral/substitution trick