clean up in util/nondecreasing.v
Small proof tweaks in util/nondecreasing.v
Even though this file will (probably) be eventually deleted (#77), the exact date is unknown, so it makes sense to clean it up as well.
Small proof tweaks in util/nondecreasing.v
Even though this file will (probably) be eventually deleted (#77), the exact date is unknown, so it makes sense to clean it up as well.