I am very frustated

I would like a case insensitive index, i.e. the words "Entry" and "entry" should be indexed together:
Code: Select all
entry, 1,2
Code: Select all
\DeclareRobustCommand\minterm[1]{
\index{\lowercase{#1}}
#1
}
\DeclareRobustCommand\minterm[1]{
\lowercase{\index{#1}}
#1
}
\DeclareRobustCommand\minterm[1]{
\def\Term{\lowercase{#1}}%
\index{\Term}
#1
}
It seems that nobody had this need: I've looked at CTAN archive, but I didn't find any help.
Any help?
Thank you very much.
Nino