Timeline for Is there a fast way to check if a matrix has any small eigenvalues?
Current License: CC BY-SA 4.0
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| Jan 27 at 17:47 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 27 at 16:17 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 26 at 20:53 | comment | added | Will Jagy | @GordonRoyle yes, both qfsign() and qfgaussred() use exact arithmetic, integer and rational numbers | |
| Jan 26 at 18:42 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 26 at 18:31 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 25 at 19:06 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 25 at 18:09 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 25 at 7:53 | comment | added | Gordon Royle | The command "qfsign" from Pari/GP computes the signature of the quadratic form associated with the matrix - I have never dared to use it because I do not know if it uses exact arithmetic, and I have been bitten too many times by numerical instability. But your answer here suggests that it is possible to do this in rational arithmetic - do you know if Pari/GP actually does this? | |
| Jan 24 at 21:26 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 21:15 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 20:26 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 20:19 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 20:09 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 20:01 | history | edited | Will Jagy | CC BY-SA 4.0 |
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| Jan 24 at 19:56 | history | answered | Will Jagy | CC BY-SA 4.0 |