>>583 補足
”The most well known one is:
Conjecture 1.0.1. Euler’s constant is irrational.”やで（＾＾
γ有理数予想は、検索しても無かったよ（＾＾；
γ有理数の証明、絶対間違っていると思うよ

（参考）
スレ58 https://rio2016.5ch.net/test/read.cgi/math/1547388554/730
730 名前：現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE [sage] 投稿日：2019/01/24(木) 21:21:55.52 ID:HmyDNHis [12/17]
http://www.ams.org/journals/bull/2013-50-04/S0273-0979-2013-01423-X/
AMS
Euler's constant: Euler's work and modern developments
Author: Jeffrey C. Lagarias
Journal: Bull. Amer. Math. Soc. 50 (2013), 527-628
MSC (2010): Primary 11J02; Secondary 01A50, 11J72, 11J81, 11M06
http://www.ams.org/journals/bull/2013-50-04/S0273-0979-2013-01423-X/S0273-0979-2013-01423-X.pdf
(抜粋)
Abstract. This paper has two parts. The first part surveys Euler’s work
on the constant γ = 0.57721 ・ ・ ・ bearing his name, together with some of his
related work on the gamma function, values of the zeta function, and divergent
series. The second part describes various mathematical developments
involving Euler’s constant, as well as another constant, the Euler?Gompertz
constant. These developments include connections with arithmetic functions
and the Riemann hypothesis, and with sieve methods, random permutations,
and random matrix products. It also includes recent results on Diophantine
approximation and transcendence related to Euler’s constant.

There are many famous unsolved problems about the nature of this constant.
The most well known one is:
Conjecture 1.0.1. Euler’s constant is irrational.
This is a long-standing open problem. A recent and stronger version of it is the following.
Conjecture 1.0.2. Euler’s constant is not a Kontsevich?Zagier period.
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