Paris is in France.London is in England.If Paris is in France,then London is in England.
A lack of space before continuing after a comma or a period is something I have rarely seen except when it's an inadvertent typo, except on math.stackexchange.com. If it occurs 30 times in one posting without a single instance of what I was brought up to consider the standard form, that's not a typo. If I look at 30 posted questions and eight of them follow that form, and if that happens every day for several years (and it has) then I wonder what's going on. Two guesses:
- Some people use software to create MathJax code rather than doing it by hand, and it often writes code that looks like something a psychotic would write. Might it be that that same software is doing this?
- Is there some country (e.g. maybe India?) where this is standard and where many of those who post here live?