Space And Geometry in the Light of Physiological, Psychological And Physical Inquiry
The book Space And Geometry in the Light of Physiological, Psychological And Physical Inquiry was written by author Mach, Ernst, 1838-1916 Here you can read free online of Space And Geometry in the Light of Physiological, Psychological And Physical Inquiry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Space And Geometry in the Light of Physiological, Psychological And Physical Inquiry a good or bad book?
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Visualization alone cannot inform us of this fact; we can learn it only from experi- menting in thought, — ^a procedure which both re- poses on physical experience and reproduces it. This will be seen by holding a fast, for example, and turning b, first, until it forms the prolongation of a, and, secondly, until it coincides with a. A straight line is primarily a unique concrete image character- ized by physiological properties, — ^an image which we have obtained from a physical body of a defin...ite 76 SPACE AND GEOMETRY Specific character, which in the form of a string or wire of indefinitely small but constant thickness in- terposes a minimum of volume between the posi- tions of its extremities, — ^which can be accomplished only in one uniquely-determined manner. If sev- eral straight lines pass through a point, we distin- guish between them physiologically by their direc- tions. But in abstract space obtained by metrical experiences with physical objects, differences of di- rection do not exist A straight line passing through a point can be completely determined in ab- stract space only by assigning a second physical point on it.
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