LA CONSTANTE D'EULER

π and e are undoubtedly the two most famous mathematical constants. Next come probably the golden ratio and... Euler's constant. This video is dedicated to the latter, denoted by the lowercase Greek letter γ (gamma). Some useful links: Calculating hundreds of billions of decimal places of γ with the Y-cruncher software: https://ehfd.github.io/world-record/e... The article by Berndt and Huber on Ramanujan's formula: https://scholarworks.utrgv.edu/cgi/vi... Two articles co-authored by Xavier Gourdon and Pascal Sebbah: http://numbers.computation.free.fr/Co... http://numbers.computation.free.fr/Co... Video outline: 00:00 Introduction 00:26 Supposed origin of the π notation 01:05 Supposed origin of the e notation 01:54 Definition of the Euler-Mascheroni constant 02:47 Three clarifications... 04:09 Presentation of the three parts 04:40 Part 1: Convergence 07:59 Part 2: Asymptotic expansion for H(n) = 1 + 1/2 + ... + 1/n 10:26 Part 3: Some elegant formulas involving γ 12:35 Epilogue