## wio 2 years ago I finally published my chrome extension. What it does: -Adds a button 'Notebook' next to 'Draw' button to open up notebook -You can store pieces of text (notes) in your notebook. -You can search your notebook for a particular note. -You can insert the note into the reply. -You can import and export your notebook, to back it up or share with others. Where to get it: https://chrome.google.com/webstore/detail/open-study-notebook/nmdboeolmlhaaepahmeklccofcbbmpdc Filling up notebook: Notebooks start out with only one benign note. You can import what I have in my notebook if you'd like:  [{"title":"Welcome","body":"Thank you for using the OpenStudy notebook extension."},{"title":"Slope Point Formula","body":"The equation of a line with slope \$$m\$$ that goes through the point \$$(x_0,y_0)\$$ is given by: \$\ny-y_0 = m (x-x_0)\n\$"},{"title":"Tangent Line Formula","body":"The equation of the tangent line to a function \$$f(x)\$$ at \$$x_0\$$ is given by: \$\ny-f(x_0) = f'(x_0) (x-x_0)\n\$"},{"title":"Definition of the Derivative","body":"The derivative of a function \$$f(x)\$$ is defined as: \$\nf'(x) = \\lim_{h\\to 0}\\frac{f(x+h)-f(x)}{h}\n\$"},{"title":"Definition of the Limit","body":"The limit: \$\n\\lim_{x\\to a}f(x) = L\n\$Is defined as: \$\n\\forall \\epsilon\\; \\exists \\delta\\;\\\\\n\\forall x\\quad 0<|x-a|<\\delta \\implies |f(x)-L|<\\epsilon\n\$That is: \nIf I come up with an \$$\\epsilon\$$ you will always be able to give me a \$$\\delta\$$ such that\nWhenever \$$x\$$ within your \$$\\delta\$$ range, \$$f(x)\$$ will be be within my \\(\\epsilo...n(x^n)' &=&nx^{n-1}\\\\\n(e^x)'&=& e^x\\\\\n(a^x)'&=& a^x\\ln(a)\\\\\n(\\ln(x))'&=& \\frac{1}{x}\\\\\n(\\sin(x))'&=& \\cos(x)\\\\\n(\\cos(x))'&=& -\\sin(x)\\\\\n(\\tan(x))'&=& \\sec^2(x)\\\\\n(\\sec(x))'&=& \\sec(x)\\tan(x)\\\\\n(\\csc(x))'&=& -\\csc(x)\\cot(x)\\\\\n(\\cot(x))'&=& -\\csc^2(x)\\\\\n\\end{array}\n\\]"},{"title":"Heaviside Function","body":"The Heaviside unit step function is defined as: \$\nH(x)=\\begin{cases}\n0&x<0\\\\\n1&x>0\n\\end{cases}\n\$A piecewise function can be converted to a non-piecewise using it:\n\$\n\\begin{cases}\nf(x)&x<c\\\\\ng(x)&x>c\n\\end{cases}\n\\quad =\\quad f(x)+[g(x)-f(x)]H(x-c)\n\$\nProof: \$\n\\begin{split}\n&\\begin{cases}\nf(x)&x<c\\\\\ng(x)&x>c\n\\end{cases}\\\\\n=&\nf(x) +\n\\begin{cases}\n0&x<c\\\\\ng(x)-f(x)&x>c\n\\end{cases}\\\\\n=&\nf(x) +\n(g(x)-f(x))\\begin{cases}\n0&x<c\\\\\n1&x>c\n\\end{cases}\\\\\n=&\nf(x) +\n(g(x)-f(x))\\begin{cases}\n0&x-c<0\\\\\n1&x-c>0\n\\end{cases}\\\\\n=&f(x)+[g(x)-f(x)]H(x-c)\n\\end{split}\n\$"}]  Where are notes stored? Notes are stored in a JSON array using localStorage. If you delete your localStorage without backing up your notebook, then all the notes will be gone. Firefox/Other Browsers: I dunno if I'll make a version for other browsers, because I don't really use them. You're welcome to make look at my code and make your own version. GitHub: The code is open source, so you can look at it anytime you want. https://github.com/wiogit/OpenStudyNotebook

1. wio

Any feedback is appreciated.

2. nincompoop

It looks cool and promising. I am also trying to get rid of the long-winded coding required for latex display utilizing mathtype software. All equations may be exported or converted into MathML or varying Latex versions using the built-in translation of MathType. There will be no plug-in requirement. However, this is only beneficial for those who have MathType software installed into their Mac or Windows.

3. wio

@nincompoop Can you explain a bit what you mean?

4. nincompoop

I am trying to to make mathematical equations entry easier without the requirement of coding in Latex.

5. wio

What about the equation editor?

6. nincompoop

The editor is fine. I am looking for ways to be able to enter equations faster. it is a pain to use the equation editor and it doesn't allow a carriage return (new line). There are a lot of symbols missing also. Having to just click the quadratic formula instead of entering them character by character saves a lot of trouble

7. wio

I just made a note with the quadratic formula in it.

8. mathslover

WoW , its great Wio. Excellent work. Admins of OS would surely like this

9. AravindG

COOL !!

10. AravindG

Its really handy :)

11. Koikkara

where?

12. RnR

It'll be really helpful. Great job. :D

13. jack63

that is really awsome the admins of os can't say no to that!

14. Sean_Anderson

WOW GREAT JOB! :D

15. dumbsearch2

Amazing! :) Fantastic! :D BTW I'm @sean_anderson :)

16. TheSmartOne

Good Job. :)

17. Abhisar

@wio how to export/backup notebook data?

18. wio

bottom left corner, note library

19. Abhisar

Thank you.

20. Abhisar

Okay, now where are the notes saved?

21. wio

No, you have to back them up yourself.

22. wio

Normally they're stored local storage. If that is wiped and you don't save them somewhere, then they're gone.

23. Abhisar

Yes, that's what I am not sure about. Where in the local storage are they stored?

24. wio
25. Abhisar

oh ! so they are stored using the JSON array in local storage of browser?

26. TheSmartOne

@Abhisar you just click "Note Library" and just copy the code and save it. In case it gets wiped you take what you had saved and click back on it and paste it there to get all of your notes again.