From Wikipedia, the free encyclopedia
This editor is a Grand Tutnum Book of Knowledge with Coffee Cup Stain I love reading and studying physics. I like (fast) trains and architecture. I am interested in certain technical matters.
User boxes [ edit ] Group 1: Learning [ edit ] This user believes that one should never stop feeding one's brain.
This user loves libraries
Group 2: Math and Physics [ edit ] This user's favorite subject is physics
∂
∂
x
{\displaystyle \textstyle {\frac {\partial }{\partial x}}\,\;}
This user only partially understands mathematics
This user knows by heart the first
16 digits in the decimal representation of
pi .
2
{\displaystyle {\sqrt {2}}}
This user knows how to prove that the square root of two
e
≠
p
q
{\displaystyle e\neq {\frac {p}{q}}}
This user can prove that the number, e
π
≠
p
q
{\displaystyle \pi \neq {\frac {p}{q}}}
This user can prove that
π
{\displaystyle \pi }
Group 3: Hobbies and Miscellany [ edit ] This user does not
smoke .
This user drinks milk
3R This user believes that you should Reduce, Reuse, Recycle.
Group 4: Software [ edit ] La Te X This user can typeset using La Te X
Group 5: Entertainment [ edit ]
Contributions [ edit ]
Pages I created [ edit ] Pages I edited a lot [ edit ] Physics and mathematics [ edit ] Books, libraries, and education [ edit ] Technology [ edit ] Demographics [ edit ] Society and culture [ edit ] Some useful La Te X code [ edit ] Aligning and spacing [ edit ]
3
+
x
=
4
we are trying to solve for
x
x
=
4
−
3
Subtract 3 from both sides
x
=
1
x
must be one
{\displaystyle {\begin{aligned}3+x&=4&&{\text{we are trying to solve for }}x\\[6pt]x&=4-3&&{\text{Subtract 3 from both sides}}\\x&=1&&x{\text{ must be one}}\end{aligned}}}
Boundaries of integration [ edit ] Standard way:
∫
0
∞
e
−
a
x
2
d
x
=
1
2
π
a
and
∭
R
3
⟨
Ψ
|
Ψ
⟩
d
x
d
y
d
z
=
1
{\displaystyle \int _{0}^{\infty }e^{-ax^{2}}\,dx={\frac {1}{2}}{\sqrt {\frac {\pi }{a}}}\qquad {\text{and}}\qquad \iiint _{\mathbb {R} ^{3}}\langle \Psi |\Psi \rangle \,dx\,dy\,dz=1}
Preferred way:
∫
0
∞
sin
x
x
d
x
=
π
2
and
∭
R
3
e
−
a
(
x
2
+
y
2
+
z
2
)
d
x
d
y
d
z
=
(
π
a
)
3
/
2
{\displaystyle \int \limits _{0}^{\infty }{\frac {\sin x}{x}}dx={\frac {\pi }{2}}\qquad {\text{and}}\qquad \iiint \limits _{\mathbb {R} ^{3}}e^{-a(x^{2}+y^{2}+z^{2})}\,dx\,dy\,dz=\left({\frac {\pi }{a}}\right)^{3/2}}
Nice quotes [ edit ]
“
If you don't talk the way they understand, you'll not become their friend.
”
— Cédric Villani .[1]
“
Rise above oneself and grasp the world.
”
— Attributed to Archimedes [2]
“
I don't try to do very much that is obviously flashy. I try to focus on the fundamentals of the material. I very much enjoy trying to get a complete grasp of the subject I'm trying to teach so that I can present it in a clear, consistent and thorough way.
”
— Robert M. Wald[3]
Soothing music [ edit ]
Gymnopédies No.1 by Erick Satie.
Clair de Lune by Claude Debussy.
Grande valse brillante in E-flat major, Op. 18, by Frédéric Chopin.
References [ edit ] 
![{\displaystyle {\begin{aligned}3+x&=4&&{\text{we are trying to solve for }}x\\[6pt]x&=4-3&&{\text{Subtract 3 from both sides}}\\x&=1&&x{\text{ must be one}}\end{aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a6c4b8ba815e546bd26476ffa9c4f3374999df48)
