Where does “self-commutator” come from?
self-commutator (English) comes from English commutator, from English commutation, from French commutation, from Latin commutatio, from Latin commūtō, from Latin cōn-, from Latin cum, from Old Latin com — to bend; curve; arch; vault; to bow, bend, arch,...
self-commutator (English): Given a bounded linear operator B and its adjoint B^*, the self-commutator is B^*B - BB^*
Definitions
- Given a bounded linear operator B and its adjoint B^*, the self-commutator is B^*B - BB^*
Ancestry of “self-commutator”, step by step
self-commutator traces back through two separate lines of ancestry.
via English commutator
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | commutator | An electrical switch, in a generator or motor,... |
| 2 | English | commutation | A passing from one state to another; change;... |
| 3 | French | commutation | commutation |
| 4 | Latin | commutatio | change, alteration, reversal; upheaval; exchange |
| 5 | Latin | commūtō | to change or alter entirely; modify, correct, reform, transform |
| 6 | Latin | cōn- | Used in compounds to indicate a being or bringing together of several objects |
| 7 | Latin | cum | with, along with; at; -fold |
| 8 | Old Latin | com | Alternative form of cum |
| 9 | Proto-Italic | kom | with, along, at |
| 10 | Proto-Indo-European | ḱóm | beside, near, by, with |
| 11 | Proto-Indo-European | ḱe | Deictic particle, here; Post-positional... |
| 12 | Middle English | kyt | — |
| 13 | German | kitt | putty certain kinds of cement used for fixing e.g. window panes |
| 14 | Old High German | kuti | — |
| 15 | Proto-West Germanic | kwidu | gum, resin |
| 16 | Proto-Germanic | kweduz | resin |
| 17 | Proto-Indo-European | gʷet- | resin, gum; to say, speak |
| 18 | Proto-Indo-European | gū- | to bend; curve; arch; vault; to bow, bend, arch,... |
via English Self
| Step | Language | Word | Meaning |
|---|---|---|---|
| 1 | English | Self | Himself, herself, itself, themself, themselves; that specific (person mentioned) |
| 2 | Middle English | salve | Alternative form of sauf |
| 3 | Old English | sealf | salve |
| 4 | Proto-West Germanic | salbu | salve, ointment |
| 5 | Proto-Germanic | salbō | salve, ointment |
| 6 | Proto-Indo-European | solp-éh₂ | — |
| 7 | Proto-Indo-European | selp- | fat, oil |