How many dots do I have to write?

Question

This seems very odd and silly. But I do not know where else to ask.

This question occurs to me whenever I write an infinite sequence, sum or decimal points etc.

Ex: $ 1.2 + 2.3 + 3.4 + ……………$

Ex: $1.2345 .....$

How many dots are used to represent that it follows the same pattern endlessly?

Is there a certain number of dots that should be written?

Answer 1

Ex : $1.2 + 2.3 + 3.4 + \dotsb$

MathJax: $1.2 + 2.3 + 3.4 + \dotsb$ (“dots with binary operators/relations”)

Ex : $1.2345 \dotso$

MathJax: $1.2345 \dotso$ (“other dots”)

See Martin's MathJax Guide, 4.6. Dots