They've also been used to design analog-to-digital converters that work better than hand-designed A/D converters. The kicker is that we don't know exactly how t

They've also been used to design analog-to-digital converters that work better than hand-designed A/D converters. The kicker is that we don't know exactly how they work, nor have we proven that they are "correct." But we've tested them enough that we're confident enough to ship them in products.