What is an Intrinsically Straight Path?
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1 What is an Intrinsically Straight Path? Dictionary.com: locally minimizes the distance. Equivalently, it is a path of minimal curvature. Yan-Bin Jia: The term geodesic comes from the science of geodesy, which is concerned with measurements of the earth s surface... Carl Gustav Jacobi ( ) studied the shortest curves on an ellipsoid of rotation which he referred to as geodesic curves
2 symmetry and our feet rolling arguments (covering arguments in general) 1.Can a geodesic ever intersect itself? Why? 2. How many differently shaped geodesics can you find? What do they look like? Explain. 3. Is straight always shortest distance? Explain. 4. Is shortest distance always straight? Explain. 5. How many geodesics join 2 points? Why?
3 If a surface is smooth (in the C 2 sense, with local coordinates whose first and second derivatives exist and are continuous), then a geodesic on the surface is always the locally shortest path between nearby points. If the surface is also geodesically complete (that is, every geodesic on it can be extended indefinitely, for example, there are no holes), then any two points can be joined by a geodesic that is the shortest path.
4 symmetry and our feet rolling arguments (covering arguments in general) 1. Geodesic ever intersect itself?
5 symmetry and our feet rolling arguments (covering arguments in general) 1. Geodesic ever intersect itself? Yes. horizontal circle 2. Shapes?
6 symmetry and our feet rolling arguments (covering arguments in general) 1. Geodesic ever intersect itself? Yes. horizontal circle 2. Shapes? vertical lines, horizontal circles, helices (constant angle is made with the z-axis because it is a straight line on the unrolled cylinder) 3. Straight always shortest distance?
7 symmetry and our feet rolling arguments (covering arguments in general) 1. Geodesic ever intersect itself? Yes. horizontal circle 2. Shapes? vertical lines, horizontal circles, helices (constant angle is made with the z-axis because it is a straight line on the unrolled cylinder) 3. Straight always shortest distance? No. or circle backside 4. Shortest distance always straight?
8 symmetry and our feet rolling arguments (covering arguments in general) 1. Geodesic ever intersect itself? Yes. horizontal circle 2. Shapes? vertical lines, horizontal circles, helices (constant angle is made with the z-axis because it is a straight line on the unrolled cylinder) 3. Straight always shortest distance? No. or circle backside 4. Shortest distance always straight? Yes. shortest on cylinder is shortest on covering & hence intrinsically straight on both 5. How many geodesics join 2 points?
9 5. How many geodesics join 2 points? A 2-sheeted covering: Fold a paper in half vertically so you have 2 equal regions Label point A on each edge at the same height (3 As) Choose Bs not on the same vertical or horizontal line as A Draw a line between every A and every B. Marker is best. Roll the sheet up so As match & examine the geodesics
10 5. How many geodesics join 2 points? A 2-sheeted covering: Fold a paper in half vertically so you have 2 equal regions Label point A on each edge at the same height (3 As) Choose Bs not on the same vertical or horizontal line as A Draw a line between every A and every B. Marker is best. Roll the sheet up so As match & examine the geodesics
11 5. How many geodesics join 2 points? horizontal points: 1 (they are part of the same geodesic circle, aside from # times it overlaps or goes around front or back) non-horizontal points: (countably)
12 5. How many geodesics join 2 points? horizontal points: 1 (they are part of the same geodesic circle, aside from # times it overlaps or goes around front or back) non-horizontal points: (countably)
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