Ayo Edebiri shows her work in Proof

The more seasoned Broadway actors have the run of the stage: Ha’s Hal is layered and endearing, and Kara Young—as Catherine’s bougie and bossy sister, Claire, a currency analyst—is terrific as always, spinning out inventive riffs of comedic business while also conveying genuine concern. (Is there nothing the dazzling Young can’t do?) They all have moments, but the equilibrium is off, and the pace lags when Claire is offstage. I would be interested to see Proof later in the run, when Edebiri has relaxed into her role and the production has had more time to work out the lumps, the approximations, the spots where you can see the stitches. It gets where it needs to go; what it lacks, at least for now, is elegance.