Update...

Update 12.temporary_ins/05.coordinates-systems/40.spherical-coordinates/20.overview/cheatsheet.fr.md

12.temporary_ins/05.coordinates-systems/40.spherical-coordinates/20.overview/cheatsheet.fr.md

@@ -12,6 +12,15 @@ lessons:
       order: 2
 ---
 
+<!--caligraphie de l'intégrale double curviligne-->
+$`\def\oiint{\displaystyle\mathop{{\iint}\mkern-18mu \scriptsize \bigcirc}}`$
+$`\def\Ltau{\Large{\tau}\normalsize}`$
+$`\def\Sopen{\mathscr{S}_{\smile}}`$
+$`\def\Sclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
+$`\def\Ssclosed{\mathscr{S}_{\scriptsize\bigcirc}}`$
+$`\def\PSopen{\mathscr{S}_{\smile}}`$
+$`\def\PSclosed{\mathscr{S}_{\displaystyle\tiny\bigcirc}}`$
+
 *Cours en construction*, **non validé**.    
 ![](https://m3p2.com/fr/temporary_ins/images/M3P2-validity-state-FR_L1200.jpg)   
 ![](https://m3p2.com/fr/temporary_ins/images/M3P2-maturity-4_L1200.jpg)<details>