- #1
Rasalhague
- 1,387
- 2
They aren't equivalent in general, but do they ever coincide, and, if so, under what conditions? I've seen both denoted by juxtaposition. Is there a way to tell, in such cases, which is meant, or is it necessary to always use a different notation for the tensor product when the geometric product is denoted by juxtaposition? E.g. using juxtaposition for the geometric product, I think
[tex]\mathrm{d}x \, \mathrm{d}y = \mathrm{d}x \wedge \mathrm{d}y[/tex]
since this is a 2-form, being the exterior derivative of [itex]x \, \mathrm{d}y[/itex], and therefore antisymmetric, but is this equivalent to
[tex]\mathrm{d}x \otimes \mathrm{d}y \enspace ?[/tex]
And would I be right in thinking that
[tex]\mathrm{d}x^\alpha \otimes \mathrm{d}x^\beta \neq \mathrm{d}x^\alpha \wedge \mathrm{d}x^\beta \enspace[/tex]
since
[tex]\mathrm{d}x^\alpha \otimes \mathrm{d}x^\alpha \neq \mathrm{d}x^\alpha \wedge \mathrm{d}x^\alpha \enspace = 0[/tex]
[tex]\mathrm{d}x \, \mathrm{d}y = \mathrm{d}x \wedge \mathrm{d}y[/tex]
since this is a 2-form, being the exterior derivative of [itex]x \, \mathrm{d}y[/itex], and therefore antisymmetric, but is this equivalent to
[tex]\mathrm{d}x \otimes \mathrm{d}y \enspace ?[/tex]
And would I be right in thinking that
[tex]\mathrm{d}x^\alpha \otimes \mathrm{d}x^\beta \neq \mathrm{d}x^\alpha \wedge \mathrm{d}x^\beta \enspace[/tex]
since
[tex]\mathrm{d}x^\alpha \otimes \mathrm{d}x^\alpha \neq \mathrm{d}x^\alpha \wedge \mathrm{d}x^\alpha \enspace = 0[/tex]