Timeline for Why is the matrix of all 1's called "J"?
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
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| Jan 24, 2019 at 18:14 | comment | added | Linas | If we are going to be unfortunate, then J is also used in almost-complex geometry/analysis to stand for a completely different matrix that squares to -1 (called the "symplectic matrix" or something like that). | |
| Jan 24, 2019 at 14:57 | comment | added | LSpice | Unfortunately $E$ is also commonly used for a matrix with only one non-zero entry (often subscripted, like $E_{i j}$). | |
| Jan 24, 2019 at 10:54 | history | answered | M. Winter | CC BY-SA 4.0 |