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Mathematics Math21b Spring 2018

Linear Algebra and Differential Equations

Linear algebra Math21b, Spring 2018

Course Head: Oliver Knill

Office: SciCtr 432

Email: knill@math.harvard.edu

An important picture for coordinate change (last lecture this week) |
n=9; Do[ If[IntegerQ[Sqrt[a^2+b^2+c^2+d^2]], Print[{a,b,c,d},Sqrt[a^2+b^2+c^2+d^2]]], {a,1,n},{b,a+1,n},{c,b+1,n},{d,c+1,n}];By the way, Oliver currently can not find an example of 5 numbers 1 < a < b < c < d < e whose squares add up to a square. It would be a Pythagorean sextuple without repetition. Do they exist? |

Please send questions and comments to knill@math.harvard.edu

Math21b Harvard College Course ID:110989| Oliver Knill | Spring 2018 |
Department of Mathematics |
Faculty of Art and Sciences |
Harvard University,
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