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41Because DOIs cost money.– JeffECommented Jan 29, 2016 at 23:05
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11Also note the arXiv (1991) began before DOI (2000). I knew about DOI's much later than arXiv ids.– KimballCommented Jan 29, 2016 at 23:21
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24The fact that someone is making money selling numbers to mathematicians makes me sad.– Federico PoloniCommented Sep 21, 2016 at 6:31
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4@FedericoPoloni If you get down to it, when you buy a video game, a movie, a song... It's just a (very large) number in the end.– user9646Commented Sep 21, 2016 at 12:22
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14@FedericoPoloni Well, you are not really paying for a number. You are paying for someone to make sure that number actually takes you where you want to go...– Thomas ArildsenCommented Sep 21, 2016 at 16:22
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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
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