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Pr\"ufer ring

Defines: 
Pr\"ufer ring, coefficient module, Gaussian ring
Keywords: 
fractional ideal, invertible ideal, inverse ideal
Major Section: 
Reference
Type of Math Object: 
Theorem

Mathematics Subject Classification

13C13 no label found13F05 no label found

Comments

Please, tell me, how I can do the lower index "fg"
in my object «Prüfer ring» on the right hand side of the first formula?
That is, there should be "M" with the product "fg" as lower index.
I have tried the form M_f_g, but it gives the error message "double index". Now I have written M_fg, but this does not give the right result.
pahio

M_{fg}

Thank you very much!

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