The synthetic character of geometrical truths is explained by the intuitive nature of space, their apodictic character by its apriority, and their objective reality or applicability to empirical objects by the fact that space is the condition of (external) perception. [Please select]
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The apriority is the _ratio essendi_ of the strict necessity involved in the "it must be so" _(des Soseinmüssens_), while the latter is the _ratio cognoscendi_ of the former. [Please select]
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