Full Idea
No account of an individual number is adequate unless it relates that number to the series of which it is a member.
Gist of Idea
An adequate account of a number must relate it to its series
Source
Paul Benacerraf (Logicism, Some Considerations (PhD) [1960], p.169)
A Reaction
Thus it is not totally implausible to say that 2 is several different numbers or concepts, depending on whether you see it as a natural number, an integer, a rational, or a real. This idea is the beginning of modern structuralism.