Linguistic Anomaly

Across the board in my Discrete Mathematics class is a bunch of symbols not known by folks outside my field of interest, but among them are some fairly mundane letters, such as epsilon and delta.

My teacher's frustration grows as she tries to explain a simple exercise in deductive reasoning. Yet another question is asked.

"C'mon people," she yells as she turns to the class, "it's not Greek!"

And the only noise
was one solitary giggle.

Well, yeah, it exploded after that.