rinciples of constructions in space.  She gives definitions of them
| | which are merely nominal, while the true determinations appear in the form of
| | axioms.  The relation of these assumptions remains consequently in darkness;
| | we neither perceive whether and how far their connection is necessary, nor,
| | 'a priori', whether it is possible.
|
| &quot;From Euclid to Legendre&quot;, Riemann declares, nothing
| has been done to remove this obscurity.  He continues:
|
| | The reason of this is doubtless