أرسل هذا في رسالة قصيرة: Real equiangular lines in dimension 18 and the Jacobi identity for complementary subgraphs

   _____   _    _              _    _    _    _   
  / ___// | || | ||     ___   | || | || | |  | || 
  \___ \\ | || | ||    /   || | || | || | |/\| || 
  /    // | \\_/ ||   | [] || | \\_/ || |  /\  || 
 /____//   \____//     \__ ||  \____//  |_// \_|| 
`-----`     `---`       -|_||   `---`   `-`   `-` 
                         `-`