發送短信 : Real equiangular lines in dimension 18 and the Jacobi identity for complementary subgraphs

 _    _     _____              __   __   ______   
| \  / ||  |  ___||     ___    \ \\/ // |      \\ 
|  \/  ||  | ||__      /   ||   \ ` //  |  --  // 
| .  . ||  | ||__     | [] ||    | ||   |  --  \\ 
|_|\/|_||  |_____||    \__ ||    |_||   |______// 
`-`  `-`   `-----`      -|_||    `-`'   `------`  
                         `-`