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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