Results 281 to 290 of about 107,162 (337)

Multiple Suggested Care Alternatives and Decision-Making of Primary Care Physicians: A Randomized Clinical Trial.

open access: yesJAMA Netw Open
Altinger G   +9 more
europepmc   +1 more source

The Induction Axiom and the Axiom of Choice

Mathematical Logic Quarterly, 1961
Verf. schlägt eine Modifikation des Peanoschen Axiomensystems für die natürlichen Zahlen vor, bei der statt des einwertigen Funktionsbegriffs, wie er bei der Nachfolgefunktion auftritt, der Begriff der mehrwertigen Funktion gebraucht wird, so daß es z. B. zu einer Zahl mehrere Nachfolger gibt. Die Peanoschen Axiome werden entsprechend verändert.
openaire   +1 more source

Compactness and the Axiom of Choice

Applied Categorical Structures, 1996
Four versions of compactness (equivalent in ZFC) and their properties are investigated without the axiom of choice. All the four versions are equivalent iff the axiom of choice holds (many equivalent forms concerning mainly products of spaces are given).
openaire   +1 more source

Axiom of Choice

2018
The axiom of choice is a mathematical postulate about sets: for each family of non-empty sets, there exists a function selecting one member from each set in the family. If those sets have no member in common, it postulates that there is a set having exactly one element in common with each set in the family. First formulated in 1904, the axiom of choice
openaire   +2 more sources

The Axiom of Choice in Quantum Theory

Mathematical Logic Quarterly, 1996
AbstractWe construct peculiar Hilbert spaces from counterexamples to the axiom of choice. We identify the intrinsically effective Hamiltonians with those observables of quantum theory which may coexist with such spaces. Here a self adjoint operator is intrinsically effective if and only if the Schrödinger equation of its generated semigroup is soluble ...
Brunner, Norbert   +2 more
openaire   +1 more source

The Axiom of Choice

2013
The ZF axioms allow us to assert the existence of any set whose members are selected according to some definable “rule”—this is essentially what the replacement schema says. However, we often want to assert the existence of a set without knowing a rule for selecting its members.
openaire   +1 more source

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