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Comments are not for extended discussion; this conversation has been moved to chat.– eykanalCommented Jul 11, 2017 at 13:20
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2Your "closely related question" should belong in its own question. But it is a hard number to assess.– Mindwin Remember MonicaCommented Jul 12, 2017 at 13:19
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11Three other closely related questions: why would people write open source software for free? Why would people give tutorials in conferences for free? Heck, why would people write journal articles for free and they will be sold by the publisher for high amounts of money the author will never see? I'm sure if you figure out the answer to these three closely related questions, you will realize what the answer to your original question was.– juhistCommented Jul 12, 2017 at 17:52
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18@juhist Why would people give advice to strangers about working in academia for free?– KSmartsCommented Jul 14, 2017 at 16:49
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2This is actually reasonably common with more advanced mathematics texts. Plenty of authors (Allen Hatcher, Anders Kock, Ravi Vakil etc.) put their textbooks online for free, and even those who don't put up a final version, still often put a close-to-final draft online for free.– ಠ_ಠCommented Jul 17, 2017 at 4:59
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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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