Wife's obsession with mathematics joke

A newlywed husband is discouraged by his wife's obsession with mathematics. Afraid of being second fiddle to her profession, he finally confronts her: "Do you love math more than me?"

"Of course not, dear-I love you much more!"

Happy, although sceptical, he challenges her: "Well, then prove it!"

Pondering a bit, she responds: "Ok... Let epsilon be greater than zero¡­"