Also known as the first fundamental form,
In the principal axis frame for three dimensions,
At ordinary points on a surface, the line element is positive definite.
Also known as the first fundamental form,
In the principal axis frame for three dimensions,
At ordinary points on a surface, the line element is positive definite.
Weisstein, Eric W. "Line Element." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/LineElement.html