While all this joking was going on, Muko and Amartia stood there quietly. They were getting used to their friends' behaviour towards one another and were amused but not drawn to join in.
Suddenly the four friends were almost knocked down by someone bursting through their midst like a tornado. That would have been bad enough, but this apparent nutcase of a pupil was clad only in his underpants! To make matters worse still, he started screaming at the top of his voice:
“Let epsilon be less than zero!”
He repeated this strange mantra as he ran through the courtyard, then up onto the wall where he made a complete circuit above the courtyard. Finally he disappeared from view inside the building although his crazy voice could be heard for a few moments afterwards.
Muko and his friends were shocked speechless. They had no idea what was going on.
Gelio of course had to make a joke of it. “If that was an epsi-loincloth, just as well it wasn't less than zero!” They all laughed.