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Full Idea
I will define 'quus' by x-quus-y = x + y, if x, y < 57, and otherwise it equals 5. Who is to say that this is not the function I previously meant by '+'?
Gist of Idea
'Quus' means the same as 'plus' if the ingredients are less than 57; otherwise it just produces 5
Source
Saul A. Kripke (Wittgenstein on Rules and Private Language [1982], 2)
Book Ref
Kripke,Saul: 'Wittgenstein on Rules and Private Language' [Blackwell 1993], p.9
A Reaction
Kripke's famous example, to illustrate the big new scepticism introduced by Wittgenstein's questions about the rationality of following a rule. I suspect that you have to delve into psychology to understand rule-following, rather than logic.
| 6165 | Every course of action can either accord or conflict with a rule, so there is no accord or conflict [Wittgenstein] |
| 4143 | One cannot obey a rule 'privately', because that is a practice, not the same as thinking one is obeying [Wittgenstein] |
| 7092 | If individuals can't tell if they are following a rule, how does a community do it? [Grayling on Wittgenstein] |
| 4158 | An 'inner process' stands in need of outward criteria [Wittgenstein] |
| 19269 | 'Quus' means the same as 'plus' if the ingredients are less than 57; otherwise it just produces 5 [Kripke] |
| 19271 | No rule can be fully explained [Kripke] |