Jokodo
Veteran Member
Find the contradiction.
There may not be a contradiction within this one post, or even within your current position taken together (in case you have a consistent position, highly doubtful), but it stands in contradiction to what you said earlier so it is logically impossible for you to have been right "all along" and still be right.
3 in a symbol that refers to an abstract value within an abstract system of values.
You're still unclear as to what exactly you're talking about here: The digit character '3', the string "3" of length 1 consisting of only that character, or the number 3 that string refers to. I shall assume that with 3, the symbol you meant the string "3", and with the "abstract system of values" the conceptual framework of numbers.
At any rate, it is a contradiction to what you said earlier, that numbers and digits are the same thing and only refer to themselves. Here you have, in your words, a "symbol" that refers to an "abstract value". Since symbols and abstract values are different categories, something obviously refers to something other, no matter how much you wave about.
It also follows that saying the number (represented by) 0.333... (in decimal notation) "doesn't have a last digit" is as nonsensical a thing to say as talking about disyllabic animals would be*, since numbers (your "abstract values", or something close to them) don't have digit counts as an attribute (no more than animals have syllable counts), only strings do.
Within that system it is nothing else.
Which system? The conceptual scheme of numbers, or the decimal notation as a symbolic mapping from strings to numbers?
If it's the former, and it still refers to the "symbol" a.k.a. string "3", it isn't anything in that system, it's simply not part of it - no more than the word "dog" is a mammal. If it's the latter, well obviously, although "be" is a weird verb to use here ("represent" or "refer to" would be clearer) - part of what makes the decimal system useful is that it allows strings to unambiguously refer to one and only one number. This however in no way precludes that other symbols can refer to to the same abstract value in different notations - or even in the same notation, e.g. the strings "3.0", "3.0000", "3.000...", or "2.999..." - it is not a prerequisite for the system's usefulness that it be 2-way unambiguous, and indeed it isn't.
And it does not refer to any other system.
Whatever "referring to a system" is even supposed to mean. It sounds like a random collection of words from the lexicon strung together in a grammatical but meaningless sentence to me. Maybe you meant referring to a value taken from another system?
* You might actually find something like this as a hint in crossword puzzle. To a competent speaker of English, it has a slightly off flavor since it mixes linguistic and metalinguistic usage: it is talking about a thing and it's name at the same time, the way you're inadvertently doing here all the time.
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