Billington, Michael, Review of Proof, in Guardian, May 16, 2002.

This review of the British production of Proof at London's Donmar Warehouse censures the playwright for not explaining what the crucial mathematical theory is. Billington calls this the weak point of the play.

Feingold, Michael, Review of Proof, in Village Voice, June 6, 2000.

A review that is generous in its praise. Feingold points out that Auburn has no interest in explaining the finer points of mathematics; it is simply a given that for three of the four characters, mathematics is something they love, and the play is more of a love story than anything else—love of mathematics, love of father and daughter, and the growing love of Hal and Catherine.

Heilpern, John, Review of Proof, in New York Observer, June 19, 2000, p. 5.

A laudatory review that praises the play's evocation of love between father and daughter, the fragility...