With beamer, "Missing { inserted." (regression)

[Joseph Wright]

On 18/02/2022 10:32, Vincent Lefevre wrote:
> On 2022-02-18 09:05:26 +0000, Joseph Wright wrote:
>> On 18/02/2022 03:12, Vincent Lefevre wrote:
>>> Even though the behavior was not officially supported, there were
>>> no errors without the additional braces and this was simpler and
>>> more easily readable, so that it was probably used in practice.
>>> I can see that in many of my old .tex files (not all using beamer).
>>
>> Lamport's book is entirely clear on the supported syntax for sub- and
>> superscripts.
> 
> There are other sources that are much less clear, like
> 
>    https://en.wikibooks.org/wiki/LaTeX/Mathematics#Powers_and_indices

There is a reason I referenced Lamport's book: it is the official manual 
for LaTeX. The Wikibook has some oddities.

Joseph