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The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ?

The answer is "no" for British English: "An ellipsis is never preceded or followed by a full stop." (University of Oxford Style Guide).

The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ?

The answer is "no" for British English (at least according to the University of Oxford Style Guide). For American English the answer is "yes" (at least for legal writing).

The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ? According to Wikipedia the answer is "no" for British English: "An ellipsis is never preceded or followed by a full stop." (University of Oxford Style Guide).

The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ?

The answer is "no" for British English: "An ellipsis is never preceded or followed by a full stop." (University of Oxford Style Guide).

The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ? According to Wikipedia the answer is "no" for British English: "An ellipsis is never preceded or followed by a full stop." (University of Oxford Style Guide).

The principle mentioned by Iosif Pinelis that equations should follow the rules of grammar suggests to look at the OP in the broader context of the use of ellipsis in text: is $\ldots$ to be followed by a full stop period $.$ or not ? According to Wikipedia the answer is "no" for British English: "An ellipsis is never preceded or followed by a full stop." (University of Oxford Style Guide).