28 ;;Quote: how can mathematics be so admirably appropriate to reality; by not being certain

33 ;;Quote: Poincare's view of geometry is correct; in a rotating system of reference, the laws of rigid bodies do not correspond to Euclidean geometry

35 ;;Quote: because the geometrical behaviour of real solid bodies depends on conditions, geometric predicates and physical laws about reality are conventions. They are selected so that geometry and all of physical law are in accord with experience

37 ;;Quote: distances are equal if marks upon a practically-rigid body coincide permanently with corresponding marks on the other body

237 ;;Quote: the propagation of light assigns equal tracts to equal time intervals

237+;;Quote: if ideal clocks go at the same rate, they always go at the same rate; e.g., sharp spectral lines from atoms of the same chemical element; a foundation of 4-d space-time