For every natural number x there exists another natural number
x called the successor of x.
1 # x for every natural number x (x being
the successor of x)
If x = y then x = y
If Q is a property such that:
1 has the property Q
if x has property Q then x has property Q
then the property Q holds for all natural numbers.
(bgw)
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"INTERLINGUA
de PEANO"
or Latin sine Flexione, to be used as an auxiliary language between peoples
of different mother tongues by many members of Academia pro Interlingua
(1931).