[texhax] ?

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 I need to put a letter c at the top right corner of

$$\widetilde{B}_j^i$$

I type

${\widetilde{B}_^i}^c$

it does not work.

When I type

$$\widetilde{B}_j^{i^c}$$

it looks somehow ok but there must be a right way of wrting it.

Consider first

$$A^c$$

How can I have the same look with

$$\widetilde{B}_j^i$$

instead of $A$ in $A^c$ ?

We put a letter 'c' at the top right corner of the a set to denote it's
complement if you are familier with set theory.
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