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["El.Douwen" <address@hidden>]

hi

i am typing a sigma (is there a shortcut ?)
then i type _
so i can write something just under the sigma

now i type a fraction
1 over sigma
and i want to write something under the sigma
so as the cursor is just after the sigma i type, as i did in former §, the 
character _
surprinsingly, the cursor dont go this time under the simga, but in a right 
bottom corner from the sigma

how can i write properly 1/sigma for x=1 to +infty with the x=1 just under 
the sigma ?

Sacha