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Full Idea
Frege says that parallelism is more fundamental than sameness of direction because all geometrical notions must originally be given in intuition.
Gist of Idea
Parallelism is intuitive, so it is more fundamental than sameness of direction
Source
report of Gottlob Frege (Grundlagen der Arithmetik (Foundations) [1884], §64) by Richard G. Heck - Cardinality, Counting and Equinumerosity 3
Book Ref
-: 'Notre Dame Journal of Formal Logic' [-], p.193
A Reaction
If Frege thinks some truths are more fundamental, this gives an indication of his reasons. But intuition is not a very strong base.
Related Idea
Idea 17443 Many of us find Frege's claim that truths depend on one another an obscure idea [Heck on Frege]