early outline
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A short outline document, apparently Phil's early planning notes for a tensor and wedge product exposition in the Wedge World folder. Section 1 covers bases and rules for the direct product V x W and tensors; Section 2 covers dual-space functionals and rank-2 tensors in V*. Sections 3 and 4 outline the wedge product in the V and V* settings: rules, size of the wedge space, determinants, geometric interpretation, and the Hodge relation to the cross product.
AI-written summary; may contain errors.
Extracted text (machine-read; may contain errors)
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Section 1:
state basis elements ei of V and ei' of W and then basis of V x W
state "rules" for the direct product in this V x W context
state rules which are wrong
state most general element of W x V as T = ....Tij....
specialize to V x V and describe T as a "tensor"
show the four covariant notations if ei are tangent base vectors
Section 2
state basis elements λi of V* and λi' of W*
develop some facts about these λi functionals, introducing the qi vectors.
state α and β as most general vectors in V* and W*
introduce the direct product space V* x W* and show its basis elements
assume the relation (λiλ'j)(v,w) = λi(v)λj'(w)
state the "rules" for
write most general element of V* x W* as Φ = ....
evaluate Φ at a point, so for first time have a function Φ(v,w)
expand α β onto basis and also show as a function
finally restrict to W* = V*
semantically associate both Φ and Φ(u,v) with a rank-2 tensor in V*2.
Let's try to make a dual-space vectors be Greek letters.
Section 3 Wedge in the V2 world
(a) def of the wedge
a definition of wedge product a ^ b in usual way
develop "rules" for the wedge operator using a,b,c.
state that those rules also apply for ei etc.
write most general element of W 2 as F = , then show it includes a ^ b
show how you could break basis vectors into two groups
(b) how big is W 2 ?
(c) how do determinants appear?
geometric interpretations
Hodge relation to the cross product
Section 4 Wedge in the V*2 world
(a) def of the wedge
a definition of wedge product a ^ b in usual way
develop "rules" for the wedge operator using a,b,c.
state that those rules also apply for ei etc.
write most general element of W 2 as F = , then show it includes a ^ b
show how you could break basis vectors into two groups
(b) how big is W 2 ?
(c) how do determinants appear?
geometric interpretations
Hodge relation to the cross product