The topological entropy of iterated piecewise affine maps is uncomputable.
Koiran, Pascal
Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only], Tome 4 (2001), p. 351-356 / Harvested from The Electronic Library of Mathematics
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Publié le : 2001-01-01
EUDML-ID : urn:eudml:doc:127390 
@article{01699531,
     title = {The topological entropy of iterated piecewise affine maps is uncomputable.},
     journal = {Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only]},
     volume = {4},
     year = {2001},
     pages = {351-356},
     zbl = {1112.37301},
     language = {en},
     url = {http://dml.mathdoc.fr/item/01699531}
}

Koiran, Pascal. The topological entropy of iterated piecewise affine maps is uncomputable.. Discrete Mathematics and Theoretical Computer Science. DMTCS [electronic only], Tome 4 (2001) pp. 351-356. http://gdmltest.u-ga.fr/item/01699531/