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John Harbaugh was told there would be no math.

But that doesn’t apply to Ravens guard John Urschel, their resident mathematician, who had his own way of gauging his progress from a recent concussion.

Urschel, who has published a high-level math paper (“A Cascadic Multigrid Algorithm for Computing the Fiedler Vector of Graph Laplacians,” I was just reading it last night, never did find X) has more at stake with his brain injury than some might.

So it’s no surprise that he took a different approach than some players, or his coach.

“You’re told when you get a concussion not to listen to certain things, not to read certain things, not to study certain things, not to do some certain things that might hurt the concussion part of the brain there,” Harbaugh said, via Jon Meoli of the Baltimore Sun. “So, my man goes out the second day afterwards and does high-level math problems just to see where he’s at.

“I’m going to tell the guys tonight in the meeting, ‘Listen, guys, for all you guys that may get a little concussion issue, . . . You want to go out and do the high-level math? You want to do those trigonomic [sic], algebraic equations? We’re putting an end to that right now on our team. We’ll have no more of that.’”

That’s probably not going to affect many of them, but Urschel has always been outside the norm in that regard. He’s become something of a math ambassador, appearing at numerous events to promote the confluence of brains and brawn.

And to be honest, while the independent neurological exam will determine whether he’s ready to get back on the field, it’s not like Harbaugh’s going to check his work.