Shared numbering between directives

[TimRoith]

Description / Summary

Have shared numbering for certain directives.

Value / benefit

It is very common for mathematical notes to employ shared counters for Theorems, Lemmas and Definitions, therefore it would be a great addition. It also can help structuring documents because directives that are close together in the text also have a similar counter.

Implementation details

Starting from #62 each directive has its own numbering which is useful for some situations. However, I think it is very common to have shared counters for certain directives. In LaTeX for example I usually do something like

Theorem 1
Definition 2
Remark 3
Algorithm 1
Theorem 4

where Theorem, Definition and Remark share a counter and Algorithm has its own numbering. Is it possible to have a similar mechanic for this sphinx extension?

Tasks to complete

No response

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[shailesh1729]

I second the use case. Another example is a corollary following a theorem. I find it odd to have theorem 15 followed by corollary 3. This happens because corollaries are fewer. Consecutive numbering for theorems and corollary is better.

[oremark24]

I'd like to support this feature request as well. Without ability to sync numbering of directives, the usability of the otherwise nice typesetting environment is affected a lot.