- #1
dragonlorder
- 18
- 0
I know this may sounds silly but I am confused
consider this two form for example, by substitution, I get
[tex]\omega = dx \wedge dy = d(rCos\theta)\wedge d(rSin\theta) = r dr \wedge d\theta[/tex]
also consider this smooth map [tex]F(x,y)=(rCos\theta,rSin\theta)[/tex]
then [tex]F^{*}\omega = rdr \wedge d\theta[/tex]
which means that [tex]F^{*}\omega= \omega[/tex]!?, that's just weird.
I am reading John's Lee smooth manifold book. and I saw the substitution writing at the differential form chapter. and the pullback writing at the Covector field chapter.
consider this two form for example, by substitution, I get
[tex]\omega = dx \wedge dy = d(rCos\theta)\wedge d(rSin\theta) = r dr \wedge d\theta[/tex]
also consider this smooth map [tex]F(x,y)=(rCos\theta,rSin\theta)[/tex]
then [tex]F^{*}\omega = rdr \wedge d\theta[/tex]
which means that [tex]F^{*}\omega= \omega[/tex]!?, that's just weird.
I am reading John's Lee smooth manifold book. and I saw the substitution writing at the differential form chapter. and the pullback writing at the Covector field chapter.