|Quantities, physics: measurable properties of objects, processes or states. See also Scales, Proportions, Change, Motion, Processes, Flux, Space, Time, Spacetime, Metrisability._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments. |
Quantity/physics/Genz: in the laws of nature, two types of quantities occur:
(a) those defining the physical system to which the law of nature applies
(b) the descriptions of the states that the system can accept.
State: Example law of falling bodies: Height and speed of the centre of gravity of the body. From the values of these state variables follow their values at all times,
Context: is the same for all masses.
N.B.: this is both the precondition and consequence of the law.
Independence: this independence is one of the most important laws of nature.
Relativity Theory: this independence is also the basis and consequence of the general theory of relativity.
Differentiation: between state variables and system parameters.
Mathematics/Genz: means that all future values for a system can be derived from the state values.
Open Systems/Genz: if a system is not complete, the requirement that mathematical laws of nature apply does not in itself have any consequences.
Continuous/discrete/Genz: in fact, even seemingly continuous quantities such as the angular momentum of a planet can only be expressed discreetly - quantized according to Planck's constant h. But this one is too small to be effective.
Discretion/Genz: is the prerequisite for Wheeler "Program of 20 questions" (Yes/No decisions).
Turing maschine/Genz: for them too, the discreetness of nature is a prerequisite if everything is to be simulated by Turing machines_____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Gedankenexperimente Weinheim 1999
Wie die Naturgesetze Wirklichkeit schaffen. Über Physik und Realität München 2002