English: The two functions (rightward blue arrows) and (leftward red arrows) used in the Lambek–Moser theorem to describe the partition of positive integers into prime numbers (2, 3, 5, 7, ...) and non-primes (1, 4, 6, 8, ...). Visualization based on a method of Angel, Myer (1964), "Partitions of the natural numbers", Canadian Mathematical Bulletin, 7: 219–236, doi:10.4153/CMB-1964-020-1
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Captions
The two functions f and f* used in the Lambek–Moser theorem to describe the partition of positive integers into primes and non-primes