Mention659449
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| so:text | Euclidean geometry is only one of several congruence geometries... Each of these geometries is characterized by a real number K, which for Euclidean geometry is 0, for the hyperbolic negative, and for the spherical and elliptic geometries, positive. In the case of 2-dimensional congruence spaces... K may be interpreted as the of the surface into the third dimension—whence it derives its name... (en) |
| so:isPartOf | https://en.wikiquote.org/wiki/Howard_P._Robertson |
| so:description | Geometry as a Branch of Physics (1949) (en) |
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| qkg:Quotation625306 | qkg:hasMention |
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