Thank you for your interest, Leo. Unfortunately, I'm not able to read Russian... I didn't really need a tool to manipulate bra and kets, so I didn't try to code myself neither I kept on searching how to accomplish this task... However I read that in Maple 11 there will be a Physics package that maybe could fit...

I wrote to him soon after your reply, but I had no answers... I did not insist because I don't really need that package even it would be useful to have a tool like that... Many thanks for you kind suggestion.

I wrote to him soon after your reply, but I had no answers... I did not insist because I don't really need that package even it would be useful to have a tool like that... Many thanks for you kind suggestion.

Not very much, because I was searching a package that allows to manipulate bras and kets, not just a tool for write them... However, many thanks for your kind and smart hint!

Not very much, because I was searching a package that allows to manipulate bras and kets, not just a tool for write them... However, many thanks for your kind and smart hint!