What a number is
Three is not three apples and not the numeral 3. It is what every group of three shares: groups that can be matched one to one have the same number (Frege's answer). Numerals and words are only its names. Whether numbers are real things, ideas or a language we invented is still argued about.
Depth 1 · Foundation
You can tell a number from its numerals and from the things counted, say what matched groups share, and name the main answers to what a number is.
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- 1
Foundation
You can tell a number from its numerals and from the things counted, say what matched groups share, and name the main answers to what a number is.
Your path here
What's still between you and What a number is, depth 1, in the order you can learn it.