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There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: https://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

The secret is invisible unicode characters. In answers, you can use entities in which case ​ is the one to use (and note that it consists of 7 characters so you only need 5 to get over the minimum character length). Entities in comments are escaped so you need the actual unicode character. Fortunately, this can be cut-and-pasted from the Wikipedia article http://en.wikipedia.org/wiki/Zero-width_space. If you copy the mA of the block text then you will actually have copied three characters, and deleting the first and last leaves you with a zero-width space which can be cut-and-pasted into comments.

(I should say that I approve of it being hard to do. Short comments and answers only rarely make sense and if it is in at all doubt, it should be lengthened to provide context. My answer on TeX-SX above was mildly facetious, but this answer could legitimately have been well under the 30 characters - but note that the author reverted any edits to that answer so please don't get ideas! But better zero-width spaces than MathJaX hacks.)

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: https://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

The secret is invisible unicode characters. In answers, you can use entities in which case ​ is the one to use (and note that it consists of 7 characters so you only need 5 to get over the minimum character length). Entities in comments are escaped so you need the actual unicode character. Fortunately, this can be cut-and-pasted from the Wikipedia article https://en.wikipedia.org/wiki/Zero-width_space. If you copy the mA of the block text then you will actually have copied three characters, and deleting the first and last leaves you with a zero-width space which can be cut-and-pasted into comments.

(I should say that I approve of it being hard to do. Short comments and answers only rarely make sense and if it is in at all doubt, it should be lengthened to provide context. My answer on TeX-SX above was mildly facetious, but this answer could legitimately have been well under the 30 characters - but note that the author reverted any edits to that answer so please don't get ideas! But better zero-width spaces than MathJaX hacks.)

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: http://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

The secret is invisible unicode characters. In answers, you can use entities in which case ​ is the one to use (and note that it consists of 7 characters so you only need 5 to get over the minimum character length). Entities in comments are escaped so you need the actual unicode character. Fortunately, this can be cut-and-pasted from the Wikipedia article http://en.wikipedia.org/wiki/Zero-width_space. If you copy the mA of the block text then you will actually have copied three characters, and deleting the first and last leaves you with a zero-width space which can be cut-and-pasted into comments.

(I should say that I approve of it being hard to do. Short comments and answers only rarely make sense and if it is in at all doubt, it should be lengthened to provide context. My answer on TeX-SX above was mildly facetious, but this answer could legitimately have been well under the 30 characters - but note that the author reverted any edits to that answer so please don't get ideas! But better zero-width spaces than MathJaX hacks.)

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: https://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

The secret is invisible unicode characters. In answers, you can use entities in which case ​ is the one to use (and note that it consists of 7 characters so you only need 5 to get over the minimum character length). Entities in comments are escaped so you need the actual unicode character. Fortunately, this can be cut-and-pasted from the Wikipedia article http://en.wikipedia.org/wiki/Zero-width_space. If you copy the mA of the block text then you will actually have copied three characters, and deleting the first and last leaves you with a zero-width space which can be cut-and-pasted into comments.

(I should say that I approve of it being hard to do. Short comments and answers only rarely make sense and if it is in at all doubt, it should be lengthened to provide context. My answer on TeX-SX above was mildly facetious, but this answer could legitimately have been well under the 30 characters - but note that the author reverted any edits to that answer so please don't get ideas! But better zero-width spaces than MathJaX hacks.)

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: http://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

There are alternative ways to post a short comment or answer. My shortest to date is an answer of three visible characters: http://tex.stackexchange.com/a/32692/86 I think that someone else on TeX (or meta-TeX) beat that with an answer that was two characters.

The secret is invisible unicode characters. In answers, you can use entities in which case ​ is the one to use (and note that it consists of 7 characters so you only need 5 to get over the minimum character length). Entities in comments are escaped so you need the actual unicode character. Fortunately, this can be cut-and-pasted from the Wikipedia article http://en.wikipedia.org/wiki/Zero-width_space. If you copy the mA of the block text then you will actually have copied three characters, and deleting the first and last leaves you with a zero-width space which can be cut-and-pasted into comments.

(I should say that I approve of it being hard to do. Short comments and answers only rarely make sense and if it is in at all doubt, it should be lengthened to provide context. My answer on TeX-SX above was mildly facetious, but this answer could legitimately have been well under the 30 characters - but note that the author reverted any edits to that answer so please don't get ideas! But better zero-width spaces than MathJaX hacks.)