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Le 11/09/2023 à 15:52, Stephane Legras-Decussy a écrit :On 09/09/2023 10:52 PM, Den wrote:
>Je sais pas si ça aide mais on peut voir i (de a + ib) comme un
opérateur de rotation de 90° dans le sens trigo.
Par ex. le nombre 3,4 est sur l'axe des réels, i*3,4 sur celui des
imaginaires et i * i * 3,4 retombe sur l'axe des réels puisque 90 + 90 =
180. D'où le -1.
Dans cette "explication" i est vu comme un outil, plus que comme un truc
posé a priori.
oui de même, multiplier par -1 c'est des rotations 180° autour de 0.
J'ai lu quelque part que c'est un comptable qui a trouvé ça.
Un comptable !
Normal puisqu'ils sont entraînés à comprendre que débit = crédit, de
signes opposés.
Date | Sujet | # | Auteur | |
4 Sep 23 | ![]() | 89 | Alf92 | |
5 Sep 23 | ![]() ![]() | 1 | Eric M | |
5 Sep 23 | ![]() ![]() | 87 | Ghost-Raider | |
6 Sep 23 | ![]() ![]() ![]() | 86 | Stephane Legras-Decussy | |
6 Sep 23 | ![]() ![]() ![]() ![]() | 85 | efji | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() | 84 | Ghost-Raider | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() | 82 | efji | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | Alf92 | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Thierry Houx | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 78 | Ghost-Raider | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 77 | Alf92 | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 76 | Ghost-Raider | |
7 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 75 | Stephane Legras-Decussy | |
7 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | jdanield | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Thierry Houx | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
7 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 71 | efji | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 16 | Ghost-Raider | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 15 | efji | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 9 | Ascadix | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | jdanield | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Stephane Legras-Decussy | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | jdanield | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | efji | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | Ascadix | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | jdanield | |
9 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | jdanield | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Stephane Legras-Decussy | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Ghost-Raider | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | jdanield | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 54 | Stephane Legras-Decussy | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | efji | |
8 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
9 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 51 | Den | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 50 | Stephane Legras-Decussy | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | efji | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 48 | Ghost-Raider | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 13 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 7 | "Benoît L." | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 6 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | "Benoît L." | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Eric M | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | "Benoît L." | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | "Benoît L." | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | Ghost-Raider | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 4 | jdanield | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | Ghost-Raider | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | jdanield | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 34 | Alf92 | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 15 | efji | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Alf92 | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 8 | jdanield | |
11 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 7 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | Ascadix | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 4 | Ghost-Raider | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | Ascadix | |
14 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Ghost-Raider | |
15 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ascadix | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 4 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 18 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 17 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 16 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 14 | jdanield | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 13 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 7 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 6 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | efji | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | jdanield | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Stephane Legras-Decussy | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 5 | jdanield | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 4 | Stephane Legras-Decussy | |
13 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 3 | jdanield | |
14 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 2 | Stephane Legras-Decussy | |
14 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | jdanield | |
12 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Ghost-Raider | |
6 Sep 23 | ![]() ![]() ![]() ![]() ![]() ![]() | 1 | Alf92 |
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