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You're asking them to perform subtraction. They probably know how to do that with real numbers, but problably not with much else. So they'll have to know that t
by gspr 7y ago
You're asking them to perform subtraction. They probably know how to do that with real numbers, but problably not with much else. So they'll have to know that they're real numbers (or whatever numbers you are demanding that they be – you're still unclear on this point if it's not actually the reals).
- brlewis 7y agoInternally I'm saying they're real numbers. In what I say to the person trying to intuit that 0.999... = 1, I'm deliberately avoiding talking about number systems. I'm assuming this person thinks of numbers as sequences of digits, possibly with a decimal point.
- gspr 7y agoAnd that is where it all goes wrong.