Math & Science ⇒ Problem with double subscript and accents

[nortada]

Hi all, i'm new to the forum and this is my first post.

I want to be able to define e.g.: ${\hat{A}_a}_b$

But this returns the compilation error: "! Double Script". Meanwhile I found out that the problem was with the \hat accent. If I remove it, I don't get any error in compiling: ${A_a}_b$, as expected.

The reason why I need this structure is that I want to be able to define, with the \newcommand function, math symbols involving subscripts and superscripts, e.g.:

Code: Select all

\newcommand{\Hu}{\hat{H}_{u}^{+}}

and then still be able to call this symbol with additional subscript

"The first component of the field $\Hu$ is ${\Hu}_1$".

Can somebody tell me what am I doing wrong, or suggest another way to do what I want.

Thanks in advance,

[nortada]

Could somebody please help.

[CDbile]

Hi,
I found a trick :

Code: Select all

${\hat{A}{}_a}_b$

Regards,

[nortada]

Thanks for the help.

Hi,
I found a trick :

Code: Select all

${\hat{A}{}_a}_b$

Regards,