Messbar :
Es ist entscheidbar, ob das Ziel erreicht worden ist oder nicht:
Anspruchsvoll:
www.quint-essenz.chMeasurable :
It is possible to judge whether the project objectives have been met.
Attractive:
www.quint-essenz.chIn der Vorlesung werden wichtige Methoden und Techniken vorgestellt, um
zu beurteilen, ob solche Problem überhaupt algorithmisch entscheidbar sind,
www-mgi.informatik.rwth-aachen.deIn this course we will, on the basis of numerous examples, present methods and techniques that permit us
to understand whether such problems are algorithmically decidable,
www-mgi.informatik.rwth-aachen.deSie stoppt, wenn eine der beiden Maschinen zum Halten kommt.
Satz 3.2.18 L ⊆ Σ∗ ist entscheidbar, gdw. L und L erkennbar sind.
Beweis:
www-ti.informatik.tu-cottbus.deThere is a computable sequence ( xs ) of rational numbers which converges to a nonweakly computable real number x. P r o o f.
By Ershov’s Hierarchy Theorem 3.4, there is a ∆02-set A which is not ω-r.e.
Then, by the Limit Lemma of Shoenfield [24], there is a computable sequence (As) of finite subsets of natural numbers such that limAs = A.
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