Concept
Is a quantity of water abstract or concrete, and discrete or continuous?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"A quantity of water in a glass. Would you call it abstract, or concrete? Discrete, or continuous? Concrete, since it’s a real entity you can experience with the senses. Continuous, since it could be any number of ounces (or liters, or tablespoons, or whatever). The amount of water certainly doesn’t have to be an integer. (Food for thought: since all matter is ultimately comprised of atoms, are even substances like water discrete?)"
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