The administrator of Roll Pie. I have the experience of making applications by Python, JavaScript, C#, C, Go. I have a math bachelor degree.
Do you have a side hustle?
7votes
Cutting losses to make cash is important
This is not financial advice. But I think cutting losses and keeping cash is the most important in trading. I sold some stocks today.
I sold some stocks right now. Big bounce happens gave me a chance. S&P breaks the low so I doubt that remains.
My biggest loss in 2022 will come today
I bought NVIDIA and Shopify in this week. I sold some of them but I have enough amount of stocks now. CPI is 8.2 percent over the last 12 months...
Because Rollpie (this website) is my project. Thank you for signing up and commenting.
I like Meta too. I think Meta's VR/AR projects will change the 3D market and dominate it in the long term!
Font size command list - LaTeX
The command `\small` changes the font size small.
How to draw table borders in LaTeX
Take an example of two column table.
How to change the bullet style of unordered list in LaTeX
You can change the label design of unordered (itemized) list to a symbol like `-`, `@`, or $\int$.
The Producer Price Index rose 0.4% in September
It's more than expected (0.2%).
Equation in an unordered list - LaTeX
An item of unordered list can have the equation in display mode. The indentation of an equation in paragraph and item are different.
Nested unordered lists in LaTeX
The bullet styles of nested unordered lists are a black circle, hyphen, asterisk and dot.
If I had bought Abbvie stock on March 23, 2020, the dividend yield would be 9%
I like Abbvie. Abbvie is a famous dividend Aristocrat stock increasing its dividend for consecutive 50 years. If I had bought it when the market...
Opening sell off and 2pm hypothesis made double rebounds of S&P 500
Today is a nightmare for me because opening and ending are so bad. A morning sell off, which means more than 1.5% falling of S&P or NASDAQ, ofte...
"The stocks I just bought collapse" theory always comes true even though "the stocks I just sell" don't collapse a lot.
The tech stocks will drop because I bought them yesterday
The stock price dips after buying the dip and goes up after selling. This is a kind of trading law so it is natural to see NVDA drop today. S&P ...
Sum and limits/nolimits commands in LaTeX display and inline modes
The command `\limits` sets an equation and sub/superscript to appear in the display style and `\nolimits` sets them to be inline.
Double summation symbols sharing the same subscript in LaTeX
The command `\mathop` enables two sum symbols to share the same subscript as follows.
LaTeX command mathclap in mathtools package removes spaces between sum symbol and equation
If a subscript is too long, the spacing around the sum symbol is automatically adjusted by the subscript.
2pm rebound strategy of S&P 500
The stock market has not changed a strong strategy that futures prices go up after 2pm so today S&P ended up 3612.
Vertical space between paragraphs in LaTeX
The space between sentences and paragraphs seem to be the same in the default settings.
How to remove auto indentations in LaTeX
Changing a global setting like `\setlength{\parindent}{0pt}` removes all indentations from your document.
I bought more NVIDIA averaging down. Today semiconductors are collapsing.
Split a long equation and align each lines of it in LaTeX
Using `amsmath` package and `multline` environment splits a long equation but the second line of splitted equation is placed to the right. On th...
How to list items in LaTeX: itemize, enumerate
The `itemize` environment and `item` command creates a unordered list of items in LaTeX. Each item starts with a black circle.
Circle over letter - LaTeX mathring command
The LaTeX command `\mathring` draws a circle over letters.
Elon Musk's tweets about political issues will hurt the future productions of Tesla
I think his recent opinions about Ukraine and Taiwan are not good and all CEOs should avoid saying stuff like that to keep making their business...
I bet on NVIDIA stock
My biggest bet has been Tesla for more than 5 years. Apple stock had been the second largest until last week and now its position is NVIDIA. Thi...
October is historically a good time to buy stocks but most major crashes like 1929 Black Monday and Tuesday occurred in October. Will the next week be the worst week of this year? Or the trend was reversed to bullish though not only economic but global political tensions will be terrible?
S&P 500 has been sticking to 3630-3640 for 2 weeks but many stocks have consistently dropped for the same period.
Verizon stock price has gone down to 36.85 by about 10% since the middle September. The stock performances of Communication Service are overall worse than any major sectors. Comcast, Charter, Paramount, AT&T lost billions of dollars.
TeXShop - LaTeX free editor for Mac
TeXShop is a well known free TeX/LaTeX editor for Mac. You can edit a tex file and output as PDF. To download and install MacTex is the simplest...
LaTeX Symbol - Integral with a circle (integral over a closed line)
The `\oint` outputs an integral over a closed line.
I have a plan to create a programming language
Hello, I am an admin of Rollpie. I am a huge fan of Python and has developed this website with Python. No doubt I love Python but I have a plan ...
What programming language do you prefer most? Please ignore the trend or salary averages of languages. Select your favorite language.
10votes
Thank you for sharing iPhone tips!
Summation symbol and fraction in LaTeX
The expressions of fraction containing a summation in the display and inline modes are slightly different like the below.
Two lines subscript in summation symbol - LaTeX
The command `substack` in `amsmath` package enables summation subscripts to be multi lines.
Sum (sigma symbols) in LaTeX
Symbol | Command --- | --- $\sum$ | \sum $\sum_{n=1}$ | \sum_{n=1} $\sum_{n=1}^{\infty}$ | \sum_{n=1}^{\infty}
LaTeX pi symbol
Symbol | Command --- | --- $\pi$ | \pi
Up down arrows - LaTeX symbols
Symbol | Command --- | --- $\updownarrow$ | \updownarrow $\Updownarrow$ | \Updownarrow
Surjective arrows - LaTeX symbols
Symbol | Command --- | --- $\twoheadrightarrow$ | \twoheadrightarrow $\twoheadleftarrow$ | \twoheadleftarrow $\xtwoheadrightarrow{function}$ | \...
Not left right arrows - LaTeX symbols
Symbol | Command --- | --- $\nleftrightarrow$ | \nleftrightarrow $\nLeftrightarrow$ | \nLeftrightarrow
Not left arrows - LaTeX symbols
Symbol | Command --- | --- $\nleftarrow$ | \nleftarrow $\nLeftarrow$ | \nLeftarrow
Not right arrows - LaTeX symbols
Symbol | Command --- | --- $\nrightarrow$ | \nrightarrow $\nRightarrow$ | \nRightarrow
Squiggly arrows - LaTeX symbols
Symbol | Command --- | --- $\leadsto$ | \leadsto $\rightsquigarrow$ | \rightsquigarrow $\leftrightsquigarrow$ | \leftrightsquigarrow
Extensible arrows - LaTeX symbols
Symbol | Command --- | --- $\xrightarrow{something}$ | \xrightarrow{something} $\xRightarrow{something}$ | \xRightarrow{something} $\xmapsto{som...
Binomial symbols in LaTeX
Symbol | Command --- | --- $\binom{n}{k}$ | \binom{n}{k} $\dbinom{n}{k}$ | \dbinom{n}{k} $\tbinom{n}{k}$ | \tbinom{n}{k} ${n \choose k}$ | {n \c...
LaTeX limit and arrow
\[ \frac{\sin x}{x} \xrightarrow[x \to 0]{} 0 \]
Primorial symbols in LaTeX
\[ \# \]
Factorial symbols in LaTeX
Symbol | Command --- | --- $3!$ | 3! $!3$ | !3 $3!!$ | 3!!
Combinatorics symbols in LaTeX
\[ {}_5 C_3 \\~\\ {}_{5} C_{3} \\~\\ {}_{5}P_{3} \\~\\ {}_{5}\textnormal{P}_{3} \\~\\ {}_{5}H_{3} \\~\\ {}_{5}\Pi_{3} \]
number
LaTeX fraction - Over command
Using `\over` and curly brackets `{}` is an easy alternative to express a LaTeX fraction.
LaTeX embedding symbols
Symbol | Command --- | --- $\hookrightarrow$ | \hookrightarrow $\hookleftarrow$ | \hookleftarrow
LaTeX nabla symbols
Symbol | Command --- | --- $\nabla$ | \nabla
Dag and dagger symbols in LaTeX
Symbol | Command --- | --- $\dag$ | \dag $\dagger$ | \dagger $\ddag$ | \ddag $\ddagger$ | \ddagger $\Dagger$ | \Dagger
Currency symbols in LaTeX
Symbol | Command --- | --- $\$$ | \$ $\pounds$ | \pounds $\yen$ | \yen
Music symbols in LaTeX
Symbol | Command --- | --- $\flat$ | \flat $\sharp$ | \sharp $\natural$ | \natural
Spade symbols in LaTeX
Symbol | Command --- | --- $\spades$ | \spades $\spadesuit$ | \spadesuit
Club symbols in LaTeX
Symbol | Command --- | --- $\clubs$ | \clubs $\clubsuit$ | \clubsuit
Diamond symbols in LaTeX
Symbol | Command --- | --- $\diamond$ | \diamond $\Diamond$ | \Diamond $\diamonds$ | \diamonds $\diamondsuit$ | \diamondsuit $\lozenge$ | \lozen...
Heart symbols in LaTeX
Symbol | Command --- | --- $\hearts$ | \hearts $\heartsuit$ | \heartsuit
Star symbols in LaTeX
Symbol | Command --- | --- $\star$ | \star $\bigstar$ | \bigstar
Arc function symbols in LaTeX
Symbol | Command --- | --- $\arcsin$ | \arcsin $\arccos$ | \arccos $\arctan$ | \arctan
Infimum symbols in LaTeX
Symbol | Command --- | --- $\inf$ | \inf $\liminf$ | \liminf
Supremum symbols in LaTeX
Symbol | Command --- | --- $\sup$ | \sup $\limsup$ | \limsup
Minimum symbols in LaTeX
Symbol | Command --- | --- $\min$ | \min $\inf$ | \inf $\argmin$ | \argmin
Maximum symbols in LaTeX
Symbol | Command --- | --- $\max$ | \max $\sup$ | \sup $\argmax$ | \argmax
Arg max and arg min symbols in LaTeX
Symbol | Command --- | --- $\argmax$ | \argmax $\argmin$ | \argmin
Determinant symbols in LaTeX
Symbol | Command --- | --- $\det$ | \det $\det A$ | \det A
LaTeX equivalence symbols
Symbol | Command --- | --- $\equiv$ | \equiv $\sim$ | \sim $\approx$ | \approx $\cong$ | \cong $\simeq$ | \simeq
LaTeX less or greater than symbols
Symbol | Command --- | --- $\lessgtr$ | \lessgtr $\lesseqgtr$ | \lesseqgtr $\lesseqqgtr$ | \lesseqqgtr
LaTeX colon equal symbols
Symbol | Command --- | --- $\coloneqq$ | \coloneqq $\colonequals$ | \colonequals
LaTeX square symbols
Symbol | Command --- | --- $\square$ | \square $\Box$ | \Box $\blacksquare$ | \blacksquare
LaTeX orthogonality symbols
Symbol | Command --- | --- $\perp$ | \perp
LaTeX parallel symbols
Symbol | Command --- | --- $\parallel$ | \parallel $\nparallel$ | \nparallel
Cardinality symbols in LaTeX
Symbol | Command --- | --- $\lvert A \rvert$ | \lvert A \rvert $\overline{\overline{A}}$ | \overline{\overline{A}}
Beth symbol in LaTeX
Symbol | Command --- | --- $\beth$ | \beth
Set definition (LaTeX command)
The colon and equal symbol (definition symbol) can be written by the `coloneqq` command and what it makes looks better than what the `colon` com...
LaTeX disjoint union
Symbol | Command --- | --- $A \sqcup B$ | A \sqcup B $A \uplus B$ | A \uplus B $A \dot\cup B$ | A \dot\cup B
Complement of set | LaTeX symbols
Symbol | Command --- | --- $A^{c}$ | A^{c} $A^{C}$ | A^{C} $A^{\mathrm{C}}$ | A^{\mathrm{C}} $\bar{A}$ | \bar{A} $\overline{A}$ | \overline{A}
Power set | LaTeX symbols
Symbol | Command --- | --- $\mathcal{P}$ | \mathcal{P} $\mathfrak{P}$ | \mathfrak{P} $\wp$ | \wp $2^{S}$ | 2^{S}
LaTeX triple integral
\[ \iiint f(x,\,y,\,z)dxdydz \\~\\ \iiint f(x,\,y,\,z) \ dxdydz \\~\\ \iiint f(x,\,y,\,z) \, dxdydz \\~\\ \iiint f(x,\,y,\,z) \ dx \ dy \ dz \\~...
LaTeX double integral symbols
\[ \iint f(x)dxdy \\~\\ \iint f(x) dxdy \\~\\ \iint f(x) \ dxdy \\~\\ \iint f(x) \, dxdy \\~\\ \iint f(x) \ dx \ dy \\~\\ \iint f(x) \, dx \, dy...
LaTeX partial derivative symbols
\[ \frac{\partial y}{\partial x} \\~\\ \frac{\partial{y}}{\partial{x}} \]
LaTeX "in (a set)" and "not in" symbols
Symbol | Command --- | --- $\in$ | \in $\isin$ | \isin $\ni$ | \ni $\notin$ | \notin $\notni$ | \notni
LaTeX QED
QED
LaTeX geometry
LaTeX tensor product with subscript
Symbol | Command --- | --- $A \otimes B$ | A \otimes B $A \mathbin\otimes B$ | A \mathbin\otimes B
List of LaTeX symbols in ring and commutative algebra
Symbol | Command --- | --- $\mathfrak{a}$ | \mathfrak{a} $\mathfrak{b}$ | \mathfrak{b} $\mathfrak{p}$ | \mathfrak{p} $\mathfrak{m}$ | \mathfrak{...
List of LaTeX symbols in field theory
Symbol | Command --- | --- $L/K$ | L/K $L \mid K$ | L \mid K $L \colon K$ | L \colon K $[L \colon K]$ | [L \colon K]
List of LaTeX symbols in group theory
Symbol | Command --- | --- $G \simeq H$ | G \simeq H $G \cong H$ | G \cong H
LaTeX vector space (direct sum, product, tensor)
Symbol | Command --- | --- $V + W$ | V + W $V \oplus W$ | V \oplus W
Morphism symbols in LaTeX
Symbol | Command --- | --- $\to$ | \to $\rightarrow$ | \rightarrow $\mapsto$ | \mapsto $\hookrightarrow$ | \hookrightarrow $\twoheadrightarrow$ ...
LaTeX algebra
Hat vector in LaTeX
Symbol | Command --- | --- $\hat{v}$ | \hat{v} $\hat{\bm{v}}$ | \hat{\bm{v}} $\bm{\hat{v}}$ | \bm{\hat{v}}
Column vector in LaTeX
\[ a = \begin{bmatrix} a_1 \\ a_2 \\ \vdots \\ a_n \end{bmatrix} \]
Cross product in LaTeX
Symbol | Command --- | --- $u \times v$ | u \times v $\bm{u} \times \bm{v}$ | \bm{u} \times \bm{v}
Inner product of vectors in LaTeX
Symbol | Command --- | --- $u \cdot v$ | u \cdot v $\bm{u} \cdot \bm{v}$ | \bm{u} \cdot \bm{v}
Bold vector in LaTeX - How to make a vector bold in LaTeX
Symbol | Command --- | --- $\bm{v}$ | \bm{v} $\bm{AB}$ | \bm{AB} $\bf{v}$ | \bf{v} $\bf{AB}$ | \bf{AB} $\bold{v}$ | \bold{v} $\bold{AB}$ | \bold...
LaTeX over or under line like vector
Symbol | Command --- | --- $\overline{AB}$ | \overline{AB} $\underline{AB}$ | \underline{AB} $\underbar{AB}$ | \underbar{AB} $\overlinesegment{A...
Under vectors in LaTeX
Symbol | Command --- | --- $\underrightarrow{AB}$ | \underrightarrow{AB} $\underbar{AB}$ | \underbar{AB} $\underline{AB}$ | \underline{AB} $\und...
Left right vector in LaTeX
Symbol | Command --- | --- $\overleftrightarrow{AB}$ | \overleftrightarrow{AB} $\underleftrightarrow{AB}$ | \underleftrightarrow{AB} $\overlines...
Left vector in LaTeX
Symbol | Command --- | --- $\overleftarrow{AB}$ | \overleftarrow{AB} $\underleftarrow{AB}$ | \underleftarrow{AB} $\overleftharpoon{AB}$ | \overl...
Right vector in LaTeX
Symbol | Command --- | --- $\vec{a}$ | \vec{a} $\vec{\alpha}$ | \vec{\alpha} $\vec{abc}$ | \vec{abc} $\overrightarrow{AB}$ | \overrightarrow{AB}...
LaTeX tilde symbol (tilde, wide tilde, under tilde)
Symbol | Command --- | --- $\tilde{a}$ | \tilde{a} $\tilde{\alpha}$ | \tilde{\alpha} $\tilde{abc}$ | \tilde{abc} $\widetilde{abc}$ | \widetilde{...
LaTeX hat symbol (hat, widehat, widecheck)
Symbol | Command --- | --- $\hat{a}$ | \hat{a} $\hat{\alpha}$ | \hat{\alpha} $\hat{abc}$ | \hat{abc} $\widehat{abc}$ | \widehat{abc} $\widehat{v...
LaTeX comparison
LaTeX character
Aleph symbol in LaTeX
Symbol | Command --- | --- $\alef$ | \alef $\aleph$ | \aleph $\alefsym$ | \alefsym
LaTeX strikethrough symbols
Symbol | Command --- | --- $\sout{x = 1}$ | \sout{x = 1} $\sout{ABCxyz}$ | \sout{ABCxyz}
LaTeX Special symbols
Symbol | Command --- | --- $\text{\aa}$ | \text{\aa} $\text{\AA}$ | \text{\AA} $\text{\ae}$ | \text{\ae} $\text{\AE}$ | \text{\AE}
How to write a set of numbers in LaTeX (natural, real, complex numbers)
Symbol | Command --- | --- $\mathbb{N}$ | \mathbb{N} $\mathbb{Z}$ | \mathbb{Z} $\mathbb{Q}$ | \mathbb{Q} $\mathbb{R}$ | \mathbb{R} $\mathbb{C}$ ...
LaTeX circled letters and symbols
Symbol | Command --- | --- $\circledast$ | \circledast $\circleddash$ | \circleddash $\circledcirc$ | \circledcirc $\circledR$ | \circledR $\cir...
LaTeX bra-ket symbols
Symbol | Command --- | --- $\bra{\phi}$ | \bra{\phi} $\Bra{\phi}$ | \Bra{\phi} $\ket{\psi}$ | \ket{\psi} $\Ket{\psi}$ | \Ket{\psi} $\braket{\phi...
Because and therefore symbols in LaTeX
Symbol | Command --- | --- $\because$ | \because $\therefore$ | \therefore
Modulo symbols in LaTeX
Symbol | Command --- | --- $a \mod b$ | a \mod b $a \bmod b$ | a \bmod b $a \pmod b$ | a \pmod b $a \pod b$ | a \pod b
LaTeX and symbols
Symbol | Command --- | --- $\land$ | \land $\wedge$ | \wedge $\doublebarwedge$ | \doublebarwedge $\curlywedge$ | \curlywedge
LaTeX or symbols
Symbol | Command --- | --- $\lor$ | \lor $\vee$ | \vee $\veebar$ | \veebar $\curlyvee$ | \curlyvee
LaTeX asterisk symbols
Symbol | Command --- | --- $*$ | * $\ast$ | \ast $\circledast$ | \circledast $\divideontimes$ | \divideontimes
LaTeX limit symbols (lim inf, lim sup, inj lim, proj lim)
Symbol | Command --- | --- $\lim$ | \lim $\liminf$ | \liminf $\limsup$ | \limsup $\injlim$ | \injlim $\projlim$ | \projlim $\plim$ | \plim
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