Do they have TikZ and PGF support on OpenStudy?

Question

e.mccormick · Answer

Does not seem like it, but I thought I might be missing something if they did have it hidden in here.  Might be a nice way to do more accurate drawings and the linear algebra support is great.

$$
\begin{tikzpicture}[
	pile/.style={thick, ->, >=angle 45}
    ]
\coordinate (A) at (0,0);
\coordinate (B) at (0,2);
\coordinate (C) at (3,1);
\coordinate (D) at (3,3);
\draw[pile] (A) -- (B) node[midway,left]{$\vec{u}$};
\draw[pile] (A) -- (C) node[midway,below]{$\vec{v}$};
\draw[pile] (B) -- (D) node[midway,above]{$\vec{v}$};
\draw[pile] (C) -- (D) node[midway,right]{$\vec{u}$};
\draw[pile,dashed] (A) -- (D)  node[sloped,midway,above]{$\vec{u}\oplus\vec{v}$}  node[sloped,midway,below]{$\vec{v}\oplus\vec{u}$};
\end{tikzpicture}
$$

e.mccormick · Answer

At the {Math} $\large \cap$ {Philosophy}...
$$\Large{\sum}_{k_0=g^it_0}^{e^rG_0}D^ek_ar^{t^{es}} \doteq M^i_nd$$
...the Cartesian $k_0g^it_0~e^rG_0$ sum.

See attached for my orginal PDF version.

fibonaccichick666 · Answer

lol

e.mccormick · Answer

So, you get that, eh?  Math people see it.  Philosophy do not.

e.mccormick · Answer

A reference image for those new to matrix multiplication.

jamierox4ev3r · Answer

wonderful now my brain hurts congrats -.-

e.mccormick · Answer

Hehe.  Well, it is a Math/Philosophy joke!  What do you expect!

jamierox4ev3r · Answer

im dying slowly in the inside lol jk :P

e.mccormick · Answer

The Cogito is Descartes' most quoted piece: Cogito ergo sum = I think, therefore I am.  But Descartes is also one of the world's most famous mathematicians.  Cartesian coordinates and the entire geometric plane system!  So he sits at the intersection of math and philosophy.  Now, you take someone with a love of puns who has taken both math and philosophy, and guess what the result is...

jamierox4ev3r · Answer

you! lol jk

e.mccormick · Answer

`Text box?`  Ahh... that is it.  $$`test`$$  `$$test$$`  Hmmm....  can't mix them.

e.mccormick · Answer

```
from numbers import Number

class One:
    def __add__(self, other): return self if other == 0 else 0
    __sub__ = __add__
    def __mul__(self, other):
        if isinstance(other, Number):
            return 0 if other == 0 else self
        return other
    def __div__(self, other):
        if other == 0: raise ZeroDivisionError
        return self
    __truediv__ = __div__
    def __rdiv__(self,other): return other
    __rtruediv__ = __rdiv__
    __radd__ = __add__
    __rsub__ = __add__
    __rmul__ = __mul__
    def __str__(self): return 'one'
    __repr__ = __str__
    def __neg__(self): return self
    def __bool__(self): return True

one = One()
zero = 0
```

e.mccormick · Answer

@DebbieG /sigh

I made this for babygirl1223, but not gonna share it until she gets this right!
$3xy\left(\dfrac{\color{red}{\cancel{\color{black}{x}}}y^{\color{red}{\cancel{\color{black}{2}}}}}{\color{red}{\cancel{\color{black}{xy}}}}+\dfrac{2x^{\color{red}{\cancel{\color{black}{2}}}}\color{red}{\cancel{\color{black}{y}}}}{\color{red}{\cancel{\color{black}{xy}}}}\right)$

debbieg · Answer

Hah... very nice! :)

compassionate · Answer

404 Joke Not Found

e.mccormick · Answer

@Compassionate stalking me through my asked questions?  Hehe.

compassionate · Answer

I prefer the term "Yandere."

e.mccormick · Answer

Just think, by posting you will being Jamie back.  She will read that again, and her brain will hurt again.

compassionate · Answer

Isn't it our job as her elders to make her head hurt? A little 'sumthing' never hurt anyone, right? (;

e.mccormick · Answer

Ha, but you don't even know the joke!  You said it was not found.

compassionate · Answer

I've solved the sum. I have yet to see the joke. My head doesn't hurt - my head has no idea what I'm looking at. Math and philosophy or intersections? 

I'm sorry - but I read too much Pascal to understand simple math jokes.

compassionate · Answer

You'll have to spoon feed me with dry rice for this one.

e.mccormick · Answer

OK, if you solved the sum, what is it?

jamierox4ev3r · Answer

Guuuuys my poor head..

#unCompassionate

e.mccormick · Answer

Muhahaha

compassionate · Answer

I forgot this glorious thread existed.

e.mccormick · Answer

Yes, hiding out here, it lives in the darkness. Squirrels kept linking this pic: https://scontent-b-dfw.xx.fbcdn.net/hphotos-xfp1/t1.0-9/10307183_10201196497473614_4103644827666756531_n.jpg So I made that one to tease him back.

compassionate · Answer

Eric, you need to get your brain checked.

compassionate · Answer

Update: 

I don't remember what the joke was or the visual summation. Cannot compute

e.mccormick · Answer

Learn philosophy!

e.mccormick · Answer

@jigglypuff314 

There is also this way to get the inverse:
$\left[ 
\begin{array}{cc|cc}
a & b & 1 & 0\
c & d & 0 & 1
\end{array}
\right] $

Start with that, then solve what is left of the | to $[\begin{smallmatrix}1&0\0&1  \end{smallmatrix}]$ and then the right is the inverse.

e.mccormick · Answer

If they do not know the determinant*adjoint method, that is another way to go.  All comes down to what they know.

jigglypuff314 · Answer

*blinks* *scratches head* I'll figure that out at some point :P I just googled how to get the matrix inverse on the spot specifically to help on that question, but Matrices are one topic I know that I don't know >,<

e.mccormick · Answer

I had an intro linear algebra course.

e.mccormick · Answer

If you know gauss-jordan eliminaion, which is a way to solve systems of equations in matrices, you can also use it to find the inverse of a matrix.

jigglypuff314 · Answer

*completely gone over my head* I suppose I should study up on my Matrices ^_^"

e.mccormick · Answer

I have some worked examples you can go over and ask about: http://openstudytutorials.weebly.com/by-helper.html#e.mccormick

jigglypuff314 · Answer

oh! great, thanks! :)