Mathematics all-in-one cheat-sheet (2013) [pdf] • Hacker News Board

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#111

Post by asdfman123 » Thu, May 30, 2019, 2:41 PM UTC

supernova87a wrote: post #75

Wow, I have to say I feel somewhat bad for the author who spent so much time (months?) compiling this semi-comprehensive reference work. There's so much information, but at the same time, so little useful information to any particular reader. It's so broad as to be a hindrance to using it in any sort of daily reference. Who would use this? Wouldn't you probably resort to a reference more specific to your field? Is th…

Well, I find it extremely useful.

This is my new go-to item when someone asks me, "What would you bring with you if you could go back in time to the year 1600?"

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#112

Post by sethammons » Thu, May 30, 2019, 2:42 PM UTC

barrkel wrote: post #85

lucb1e wrote: post #69

Earlier quoted context omitted.

A B is like 80% or so, judging from A being the best iirc? I'm not familiar with alphanumeric grading systems.

Things can get a bit customized at either end of the spectrum, but generally each letter covers 15%, with A..D covering the span 100% to 40%. So a B would be 70 to 85.

Is this a new thing? I graduated highschool in 2001 and each grade letter was 10% and equated to a grade point.

    90%+ => A (4.0)
    80%+ => B (3.0)
    70%+ => C (2.0)
    60%+ => D or F depending (1.0 or 0.0)

At university, we only used grade points and they were very, very similar in scale.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#113

Post by xwin » Thu, May 30, 2019, 2:45 PM UTC

snazz wrote: post #97

mkl wrote: post #91

Earlier quoted context omitted.

Why commit the output files? I generally put "*.pdf" in .gitignore.

Probably so that someone can download it without compiling it? GitHub Releases or an equivalent would probably be better, though.

That's right. I would like others as well as myself to be easily able to download the PDF files without having to compile it. I tried out GitHub releases and it works okay but not great. I cannot track all the compiled PDFs I have at a single place or move them easily from one system to another like I could with GitHub repos. I am also trying to avoid getting locked into a specific service like GitHub releases.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#114

Post by throwawaymath » Thu, May 30, 2019, 2:49 PM UTC

barrkel wrote: post #85

lucb1e wrote: post #69

Earlier quoted context omitted.

A B is like 80% or so, judging from A being the best iirc? I'm not familiar with alphanumeric grading systems.

Things can get a bit customized at either end of the spectrum, but generally each letter covers 15%, with A..D covering the span 100% to 40%. So a B would be 70 to 85.

70 - 85 for a B?! I wish I had that deal.

At my university the letter grades were

    A+  99.00 - 100.00%
    A   93.00 -  98.99%
    A-  90.00 -  92.99%
    B+  87.00 -  89.99%
    B   83.00 -  86.99%
    B-  80.00 -  82.99%
    C+  77.00 -  79.99%
    C   73.00 -  76.99%

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#115

Post by barrkel » Thu, May 30, 2019, 2:49 PM UTC

sethammons wrote: post #112

barrkel wrote: post #85

Earlier quoted context omitted.

Things can get a bit customized at either end of the spectrum, but generally each letter covers 15%, with A..D covering the span 100% to 40%. So a B would be 70 to 85.

Is this a new thing? I graduated highschool in 2001 and each grade letter was 10% and equated to a grade point. 90%+ => A (4.0) 80%+ => B (3.0) 70%+ => C (2.0) 60%+ => D or F depending (1.0 or 0.0) At university, we only used grade points and they were very, very similar in scale.

It was the grading system in Ireland when I graduated secondary school. However, it looks like the meanings of the letter bands varies dramatically between countries.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#116

Post by americanjetset » Thu, May 30, 2019, 2:55 PM UTC

doodpants wrote: post #106

supernova87a wrote: post #75

Wow, I have to say I feel somewhat bad for the author who spent so much time (months?) compiling this semi-comprehensive reference work. There's so much information, but at the same time, so little useful information to any particular reader. It's so broad as to be a hindrance to using it in any sort of daily reference. Who would use this? Wouldn't you probably resort to a reference more specific to your field? Is th…

I'm hoping that this work might give me some valuable info on how to get started on various Project Euler[0] problems that I might otherwise have no idea how to approach, or that I wouldn't know what area of math to do research for. [0] https://projecteuler.net/

This is exactly what I thought. In fact, when I got to the section that listed the right-truncatable primes, I immediately searched Euler because I knew there was a problem about them -- turns out I had already solved it though lol.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#117

Post by lr4444lr » Thu, May 30, 2019, 3:05 PM UTC

asdfman123 wrote: post #111

supernova87a wrote: post #75

Wow, I have to say I feel somewhat bad for the author who spent so much time (months?) compiling this semi-comprehensive reference work. There's so much information, but at the same time, so little useful information to any particular reader. It's so broad as to be a hindrance to using it in any sort of daily reference. Who would use this? Wouldn't you probably resort to a reference more specific to your field? Is th…

Well, I find it extremely useful. This is my new go-to item when someone asks me, "What would you bring with you if you could go back in time to the year 1600?"

I thought I was the only one who pondered that! I think we'd have even more fun times in 1st century CE Alexandria.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#118

Post by GlenTheMachine » Thu, May 30, 2019, 3:12 PM UTC

pencillr wrote: post #41

It's awesome. Though I prefer my Bronshtein :D https://en.wikipedia.org/wiki/Bronshtein_and_Semendyayev

Bronshtein is excellent, but a bit dated. For me in particular it's lacking coverage of modern ideas on function approximation.

Also, it isn't free ;)

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#119

Post by daveFNbuck » Thu, May 30, 2019, 3:13 PM UTC

lucb1e wrote: post #69

daveFNbuck wrote: post #13

I got a B in probability because I didn't write a proof of the central limit theorem on the allowed cheat sheet for the final exam. So of course it's the first thing I looked for on this one. It's not there.

A B is like 80% or so, judging from A being the best iirc? I'm not familiar with alphanumeric grading systems.

It's typically the 80-90% range. It's also typically divided into thirds for B-/B/B+. I actually got a B+, so it would have been closer to 90%.

Re: Mathematics all-in-one cheat-sheet (2013) [pdf]

#120

Post by syn0byte » Thu, May 30, 2019, 3:21 PM UTC

rando171717 wrote: post #98

Slightly off-topic: from a security perspective, how safe/not safe is it to be clicking open random pdf's? Wouldn't this be a possible avenue for malware?

https://github.com/osnr/horrifying-pdf-experiments

https://www.alchemistowl.org/pocorgtfo/

Yes. Not only is it possible but historically already an avenue of attack.