Geodesic
On $\lambda$-definability of arithmetical functions with indeterminate values of arguments
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 39-47.

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In this paper the arithmetical functions with indeterminate values of arguments are regarded. It is known that every $\lambda$-definable arithmetical function with indeterminate values of arguments is monotonic and computable. The $\lambda$-definability of every computable, monotonic, $1$-ary arithmetical function with indeterminate values of arguments is proved. For computable, monotonic, $k$-ary, $k\ge2$, arithmetical functions with indeterminate values of arguments, the so-called diagonal property is defined. It is proved that every computable, monotonic, $k$-ary, $k\ge2$, arithmetical function with indeterminate values of arguments, which has the diagonal property, is not $\lambda$-definable. It is proved that for any $k\ge2,$ the problem of $\lambda$-definability for computable, monotonic, $k$-ary arithmetical functions with indeterminate values of arguments is algorithmic unsolvable. It is also proved that the problem of diagonal property of such functions is algorithmic unsolvable, too.
Keywords: arithmetical functions, indeterminate value of argument, monotonicity, computability, strong computability, $\lambda$-definability, algorithmic unsolvability. 
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S. A. Nigiyan. On $\lambda$-definability of arithmetical functions with indeterminate values of arguments. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2016), pp. 39-47. http://geodesic.mathdoc.fr/item/UZERU_2016_2_a6/

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