Yeah the title almost seemed like clickbait since "Euler's constant" usually means γ=0.5772... provoking a reaction of "where does that show up in optimization?

Yeah the title almost seemed like clickbait since "Euler's constant" usually means γ=0.5772... provoking a reaction of "where does that show up in optimization?". That the constant turned out to be e=2.718... which shows up all over the place was a big disappointment