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[vincent douce <address@hidden>]

hi
in the esc-esc-$ mode, if i type a=2 then esc-esc-& i get aligned equations 
(esc-esc-& mode)
very useful
a) please what is the shortcut to exchange between $ mode (equation) and 
esc-esc-$ mode (centered equation)
knowing it would be useful for me to navigate between these 3modes
b) if i type in esc-esc-$ mode : a=2+2<=>a=4 and then esc-esc-& i don't get 
the expected result
though, i would find it very useful to consider that <=> has something like 
an anteriority among =
i mean,  a=2+2<=>a=4 after esc-esc-& may give :
...........a=2+2
...<=>a=4
what do you think ?
Vincent