1er mai 1886: les ouvriers de Chicago font grève. Ils réclament la journée de travail de 8 heures. Les policiers chargent et tirent. Une bombe éclate. On arrête des ouvriers. Certains seront pendus. Le monde ouvrier va protester. Le 1er mai devient la fête des travailleurs pic.twitter.com/kkyPYTNwXg
— Jean-Francois Nadeau (@JeanFrancoisNad) May 1, 2020
Here's an invalid math proof that was considered valid for 59 years.
In 1923, Henri Dulac published an accepted solution for Hilbert's Problem 16-II, for which he was awarded several prizes. In 1982, Ilyashenko and Ecalle found a gap in the proof that was only filled in 1992. pic.twitter.com/qevhkyeG5z
