2026-06-08T01:02:47Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/334822025-04-08T14:27:13Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Conejero, Jose A.
author
Jiménez Rodríguez, P.
author
Muñoz-Fernández, Gustavo A.
author
Seoane Sepúlveda, Juan Benigno
2023-06-19T13:23:20Z
2023-06-19T13:23:20Z
2014-01
0002-9890
10.4169/amer.math.monthly.121.01.060
https://hdl.handle.net/20.500.14352/33482
http://www.jstor.org/stable/10.4169/amer.math.monthly.121.01.060
http://www.jstor.org/
The Identity Theorem states that an analytic function (real or complex) on a connected domain is uniquely determined by its values on a sequence of distinct points that converge to a point of its domain. This result is not true in general in the real setting, if we relax the analytic hypothesis on the function to infinitely many times differentiable. In fact, we construct an algebra of functions A enjoying the following properties: (i) A is uncountably infinitely generated (that is, the cardinality of a minimal system of generators of A is uncountable); (ii) every nonzero element of A is nowhere analytic; (iii) A subset of C-infinity (R); (iv) every element of A has infinitely many zeros in R; and (v) for every f is an element of A\ {0} and n is an element of N, f((n)) (the nth derivative of f) enjoys the same properties as the elements in A\ {0}.
This construction complements those made by Cater and by Kim and Kwon, and published in the American Mathematical Monthly in 1984 and 2000, respectively.
eng
When the identity theorem "seems" to fail
journal article
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amer.math.monthly.121.01.060.pdf
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amer.math.monthly.121.01.060.pdf.txt