Mathematics joke


Once wanted beginner math joke simply irresistible. And finish the evening with a little lesson in math circle, he took from the shelf a book titled "Hypersingular integrals" and a few pages sketched on a blackboard. He knew that utrechka the next day to be in this room, workshop. And the next morning found the following picture: quite muzzy people (teachers and PEOPLE from uni) sagely stand at the blackboard. Little come to himself, asked what it was here yesterday. And he meet them:
-What Is the kids in the evenings mathematics involved.