M | A | T | H |

2 | 1 | B |

Mathematics Math21b Spring 2015

Linear Algebra and Differential Equations

Exhibit: Bad Calculator ?

Course Head: Oliver Knill

Office: SciCtr 432

Email: knill@math.harvard.edu

3 -1 -1 -1 -1 2 -1 0 -1 -1 3 -1 -1 0 -1 2Here it the command Link The result

{{4, 4, 2, 0}, {{-2, 1, 0, 1}, {-1, 0, 1, 0}, {0, -1, 0, 1}, {1, 1, 1, 1}}}of the Mathematica command

Eigensystem[{{3,-1,-1,-1},{-1,2,-1,0},{-1,-1,3,-1},{-1,0,-1,2}}]Still, both outputs are right? How come?

Related, an other student sent the following screenshot of a calculation. We had learned that B=A

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

Math21b Harvard College/GSAS: 1771, Exam group 3| Oliver Knill | Spring 2015 |
Department of Mathematics |
Faculty of Art and Sciences |
Harvard University,
[Canvas],
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http://sites.fas.harvard.edu/~math21b/|
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