"For hackers" is a trick so you don't discourage people in HN. If you omit "for hackers", they'll say it has too much math and therefore no practical use. These are the same kind of people who think that the reason people use math is so they can feel smart about themselves, because practical people who want to do practical things don't need math - they have computers.
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Off topic, but this is a few spots below "Hacker's Guide to Numerical Analysis" on the front page right now. It makes the naming seem pretty silly.
Hacker News presents: X is all you need for Hackers considered harmful
"For hackers" is a trick so you don't discourage people in HN. If you omit "for hackers", they'll say it has too much math and therefore no practical use. These are the same kind of people who think that the reason people use math is so they can feel smart about themselves, because practical people who want to do practical things don't need math - they have computers.