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diff --git a/journal/02feb2009.html b/journal/02feb2009.html index 7f29192..658538a 100644 --- a/journal/02feb2009.html +++ b/journal/02feb2009.html @@ -4,7 +4,7 @@ <head><title>bnewbold thesis</title></head> <body style="margin: 25px; font-family: helvetica;"> <h1 style="border-bottom: 2px solid;"> -Journal: Jan 27, 2009</h1> +Journal: Feb 02, 2009</h1> <i>Bryan Newbold, <a href="mailto:bnewbold@mit.edu">bnewbold@mit.edu</a></i><br /> <i><a href="http://web.mit.edu/bnewbold/thesis/"> http://web.mit.edu/bnewbold/thesis/</a></i> @@ -94,7 +94,19 @@ And then interactively: <img src="02feb2009-evolve-circle-02.png" /> <br /> That looks a lot better! -<br /><br /> +<p /> +I don't know why I didn't notice it earlier, but the way dx, d/dx, etc are +defined is the instantiate-coordinates procedure. +<p /> +There's definately some funky funk in the original differential geometry memo +around page 20 w/r/t R2 vs R3 coordinates. +<p /> +From page 28: "You can tell if a set of basis vector fields is a coordinate +basis by calculating the commutators. If they are non-zero, then the basis +is not a coordinate basis." Isn't that just for orthogonal bases? Need to think +this through. + +<br /><br /> <a href="27jan2009.html"><i>(previous entry)</i></a> <!-- ================================================================ --> |