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Inverse View
It is not the case that Weyl's mathematical derivation of the metric field does not proceed directly from the conformal-causal and projective structures
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Weyl's 1921 'purely infinitesimal geometry' program explicitly reconstructs metric structure from causal and projective inputs via an axiomatic procedure.
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2.
Reichenbach and Ehlers-Pirani-Schild showed Weyl's framework is formally equivalent to deriving the metric from conformal plus projective data.
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3.
Logical equivalence of derivation directions undermines the asymmetric priority claim in P1 and P2.
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Reason for 2 of 2
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1.
In Weyl's Space-Time-Matter, the conformal structure is identified with causal propagation of light, giving it independent physical grounding prior to the full metric.
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2.
A structure with independent physical grounding cannot be treated as merely derivative, regardless of the formal order of mathematical presentation.
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Reasons Against
1 perspective
Reason against
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1.
Weyl regarded the metric and affine structures as fundamental rather than the conformal-causal and projective structures
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2.
Weyl derived the conformal and projective structures from the metric and affine structures respectively, not the reverse
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