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x^ 2 +bx+c= 0 \implies x= \frac { -b \pm \sqrt { b^ 2 -4c }}{ 2 }
% Plus minus symbol in LaTeX
x 2 + b x + c = 0 ⟹ x = − b ± √ b 2 − 4 c 2
x^ 2 +bx+c= 0 \implies x= \frac { -b \mp \sqrt { b^ 2 -4c }}{ 2 }
% Minus plus symbol in LaTeX
x 2 + b x + c = 0 ⟹ x = − b ∓ √ b 2 − 4 c 2

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In certain situations in mathematics and physics, it is common to use both a plus and a minus sign for a certain quantity, maybe because the procedure described can be explained for both signs at the same time, or because you are expressing some kind of uncertainty in physics.
In general, the plus-minus symbol is generated in LaTeX with the \pm command inside math mode. For example, the previous equation was produced with:
A minus plus symbol in LaTeX can be inserted using the command \mp . Check the following example:
x 2 + b x + c = 0 ⟹ x = − b ∓ √ b 2 − 4 c 2
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n this tutorial, we will see how to write a multiple-choice exam in LaTeX, using the exam document class. This document class provides multiple tools to easily typeset exams in LaTeX, and we have...
In this step by step tutorial, we will learn how to typeset a professional CV, and gain some more insight into how LaTeX works with a practical example.
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You need to use the default command \equiv to print equivalent symbols in a latex document. Below are some examples.

Symbol/Unicode Square/U+25A1 Type of symbol Square Package (requirement) amssymb Argument…

Symbol/Unicode Minus-plus/U+2213 Type of symbol Both minus or plus operations…

Symbol/Unicode Does Not Precede or Equal/U+22E0 Type of symbol Mathematical…

Symbol/Unicode Greater than or equal to/U+2265 Type of symbol Inequality…

Symbol/Unicode Right Left Harpoon Arrow/U+21CC Type of symbol Arrow Package…

Symbol/Unicode Ohm symbol[Big Omega]/U+03A9 Type of symbol Greek capital letter…

Symbol/Unicode Delta/U+03B4 Type of symbol Greek small letter Package (requirement)…

Symbol/Unicode nth root/U+221B Type of symbol Mathematics Package (requirement) No…

Symbol/Unicode Not Normal Subgroup of or Equal To/U+22EC Type of…
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I've tried to write \textit{P(E\ell H)} or \textit{P(E\| H)} to write | sign . But it didn't work.
If you're trying to typeset "the conditional probability of event E given event H", you should write it -- in math mode -- as
The macro \Pr is a "math operator" and its output (the letter pair "Pr") is typeset using upright Latin letters. The macro \mid inserts a vertical bar and surrounds it with whitespace, as is appropriate for a relational operator symbol.
In TeX and LaTeX, there is an absolutely fundamental distinction between text mode and math mode. Do familiarize yourself with the basics of LaTeX coding. A good starting point is the document A (Not So) Short Introduction to LaTeX , which is available in about two dozen languages.
A full MWE (minimum working example):
You can use either | or \mid . Using \mid is better as this adds the appropriate amount of spacing around the operator.
More importantly, you should enclose all of these in $...$ to put them in math-mode. You will get an error if you use \ell or mid outside of math-mode.
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I'm using Latex online (overleaf.com) for writing my trainee report.
When I tried to introduce the sign around equal ≃ it doesn't work.
I tried \simeq but not found. I entered at the beginning of the doc \usepackage{amsmath} but it still error. I tried to introduce utf8 in this way \usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
but the command \simeq is not working also I tried to put the sign ≃ by itself, and with \ it stills error too.
So my question is how to write the sign ≃ with Latex and which package should I use that allow Latex to read it correctly.
Can you Help me? Thanks for reading!
You have to wrap this \simeq in '$' sign. Try using
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