I Notion of congruent curve along a vector field

cianfa72
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About the definition of congruent curve to a given one along a vector field
Consider the following: suppose there is a smooth vector field ##X## defined on a manifold ##M##.

Take a smooth curve ##\alpha(\tau)## between two different integral curves of ##X## where ##\tau## is a parameter along it. Let ##A## and ##B## the ##\alpha(\tau)## 's intersection points with the 1st and 2nd integral curves respectively.

What is a sensibile notion of curve congruent to ##\alpha(\tau)## along the vector field ##X## starting from the point ##C## on the 1st integral curve ? I believe the answer is the Lie dragging of ##\alpha(\tau)## along ##X## from the starting point ##A## to ##C##.

Is the above correct ? Thanks.
 
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I'm a bit confused by the conditions on the existence of coordinate basis given by Frobenius's theorem. Namely, let's take a n-dimensional smooth manifold and a set of n smooth vector fields defined on it. Suppose they are pointwise linearly independent and do commute each other (i.e. zero commutator/Lie bracket). That means they span the entire tangent space at any point and since commute, they define a local coordinate basis. What does this mean? Well, starting from any point on the...

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