OK, I found this post on Tumblr and I understand *nothing*.

https://nonanalogue.tumblr.com/post/186677468062

The purpose of the mathematical language is to be non ambiguous. How does this work?

For me, the post concluding this thread is obviously wrong. Are my math just super rusty and I should be ashamed, or are people in France and in the USA not using the same notation?

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@Sylvhem Though, there are cases when even when something is written correctly it's unclear what is meant. This is the case with the traditional proper subset symbol. In some cases is means proper subset, in other cases it just means subset. The problem started arising when people started using a new symbol for proper subset. Now, it can ambiguous which system is being used

Sylvhem@Sylvhem@eldritch.cafe@violetkey I trust you on this one, I have not a lot of experience with subsets.