|Symmetries: Symmetry is an expression for the invariance of properties that are subjected to transformation such as mirroring, rotation, or displacement or repetition. Applied to theories and systems, the presence of symmetries makes greater simplicity possible._____________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. |
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Asymmetry/Symmetry: terminology/spelling/Peacocke: red*: property of the visual field - red: property of the object.
red-UV: red* property of the visual field when an (usually different color, so red-UV) object in ultra violet light appears that way. - There is no problem, to define one through the other - being-red can be left out in understanding.
Asymmetry: red/red* can be defined mixed-up, but: red* (visual field) is necessary for the Red-term (of objects), but not vice versa, because red* can be caused by both red and by red-UV objects.
Analogy: different utterances of 'I' can refer to different people, but only one general rule: the reference object is in each case the speaker (> Kaplan: 'Character'). - In the same way red and red-UV have the common character red* (in the visual field)._____________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.
Chr. R. Peacocke
Sense and Content Oxford 1983