"I used to be a retailer, and I find it discouraging when somebody comes in and they pick something up and they say, 'Now if you'll sell it to me without the sales tax, I'll buy it."

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It wouild be very discouraging if somewhere down the line you could ask a computer if the Riemann hypothesis is correct and it said, 'Yes, it is true, but you won't be able to understand the proof.' John Horgan.

— Ronald Graham