The Greater Grand Forks Community Theatre company is presenting “Proof” through Saturday, Oct. 9, as well as Oct. 14-16 and 21-23, at the Fire Hall Theatre. Performances begin at 7:30 p.m., except Sunday, when curtain time is 2 p.m.

“Proof,” by David Auburn, opened on Broadway in October 2000 and won the 2001 Pulitzer Prize for Drama and the Tony Award for Best Play.

Tickets are $20 for adults and $17 for seniors, age 65 and older; students with a college ID; and active military members. Tickets may be purchased by going to www.ggfct.com and following the ticket link; by calling (701) 746-0847 and leaving a message; or at the box office the night of the show. The box office is open one hour before show time.

In “Proof,” the story revolves around Catherine, a troubled young woman who, on the eve of her 25th birthday, has spent years caring for her brilliant but unstable father, a famous mathematician. She has inherited her father’s mathematical genius and, she fears, his mental instability.

Now, following his death, Catherine must deal with her own volatile emotions; the arrival of her estranged sister, Claire; and the attentions of Hal, a former student of her father who hopes to find valuable work in the 103 notebooks her father left behind.

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Over the long weekend that follows, a blossoming romance and the discovery of a mysterious notebook draw Catherine into the most difficult problem of all: How much of her father’s madness -- or genius -- will she inherit? The play’s title refers to her father’s paradigm-shifting proof about prime numbers and her relationship with Hal.

Directed by Chris Stoner, “Proof” features the actors Hannah Diers, Walter Criswell, Alejo Ibarra Pallotti and Amy Driscoll.

“The play is a great fit for the Fire Hall stage because it’s a small, intimate show with a cast of four talented actors,” Stoner said. “It’s all set in a backyard -- beautifully constructed by Dave Dauphinais -- and you feel like you are part of the conversation. The set is perfect for the space, not too big or too small, so you become one with the scene and just immerse yourself in the story.”

Technical direction is by David Dauphinais, with technical assistance provided by Brenna Skallet, Amy Lyste and Alex Rice.

“Proof” is a drama that contains some strong language and is not appropriate for children, said Amy Driscoll, Fire Hall Theatre’s executive director.

Masks are encouraged and appreciated, Driscoll said, and all tickets are general admission, so audience members can be socially distanced, as space allows.