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Now what?
A number is the name of the set of all sets having that number of elements.
Example: the number 1 is the name of the set of all sets having 1 element.
Numbers exist: ∃Φ ∴ ∃{Φ}
∴∃ 0
∴∃ 1∴∃{Φ,0}∴∃ 2 etc.