Mathematics – Logic
Scientific paper
2009-05-05
Comptes Rendus de l'Acad\'emie des Sciences - Series I - Mathematics 323 (1996) 439-442
Mathematics
Logic
Scientific paper
A numeral system is defined by three closed $\lambda$-terms : a normal $\lambda$-term $d_0$ for Zero, a $\lambda$-term $S_d$ for Successor, and a $\lambda$-term for Zero Test, such that the $\lambda$-terms $({S_d}^{i} ~ d_0)$ are normalizable and have different normal forms. A numeral system is said adequate iff it has a closed $\lambda$-term for Predecessor. This Note gives a simple example of a non adequate numeral system.
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