Latex Pi

Latex Pi
You need to use the \Pi command to print the Big Pi symbol in a latex document. This is the default command of latex.
You need to use \Pi_{subscript}^{superscript} command to write Limits with the Big Pie symbol. But I will not recommend this process when you use limits.
As you can see in the example above, the symbol does not look very good with limits, so it is best to use the \prod command and use \prod_{subscript}^{superscript} to add limits. This is also a default latex command. Below are some examples.

Symbol/Unicode Equipollence/U+224F Type of symbol Mathematical Operators Package (requirement) amssymb…

Symbol/Unicode Subset of Above Equals/U+2AC5 Type of symbol Mathematics Package…

Symbol/Unicode Right Loop Arrow/U+21AC Type of symbol Arrow Package (requirement)…

Symbol/Unicode Brackets/U+005B,U+005D Type of symbol Calculate expression inside first Package…

Symbol/Unicode Big Down Triangle/U+25BD Type of symbol Basic Multilingual Plane…

Symbol/Unicode Varepsilon/U+03F5 Type of symbol Greek small letter Package (requirement)…

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

Symbol/Unicode Left Right Arrow/U+2194 Type of symbol Arrow Package (requirement)…

Symbol/Unicode Not Greater Than/U+226F Type of symbol Mathematics Package (requirement)…
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Product notation is represented by the Greek alphabet pi (Π). Many of you think cross notation is product notation but not.
Default \prod command in latex is defined for this pi notation. You will see two uses of the \prod command in latex based on the location of the limit.
The command for displaying a product symbol is \prod and the general syntax for typesetting products with limits in LaTeX is
which types a product with a lower limit min and upper limit max .
Just like the integral and summation signs, the limits of the product appear differently in the inline mode and the display mode. In the inline mode, the limits appear next to the symbol and in the display mode, the limit appear below and above.
There are two commands that are capable of controlling how these limits appear. The first is the \limits command which forcefully pushes the limits below and above of this symbol in all the math modes and the second is the \nolimits command which reverse the effect(forces the limits to stay next to the product symbol in all math modes).
In other ways, you can only use the lower limits, not the upper and lower limits of the symbol. Since you will use a limit, in the lower limit you will have to use conditional symbols like less than, greater than and equal, etc.
In above output, spaces around the limit function can become very large for long indices and the mathematics may not be beautiful or presentable. LaTeX has addressed this problem by providing to commands to regulate and maintain spacing making the mathematics more presentable.
Below is how to use the \smashoperator{operator with limits} and \mathclap{math} commands. Just to emphasize, this commands apply same to summations and integrals.
We apply the two commands respectively to reduce the spacing between the index and f ijk as follows:
The \smashoperator{operator with limits} gives you a possibility to eliminate space either just from the left(l) or right(r) . Below is how to achieve that.
You can clearly see the difference above! However, be sure to use the mathtools package for both commands.
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I am writing an article and I need to write the fundamental group. For that we use $\pi_1\left(X,x_0\right)$ .
However I am arriving at the following error:
Numbers are not allowed in macro names in LaTeX:
This defines macro \pi that expects the parameter text 1et .
Use a name like \pioneet to follow the naming scheme of the
previous operator:
BTW, \' is a text mode command that is invalid in math mode.
Either use text if ét is used as word:
or math, if the accent has mathematical meaning:
Is it possible that you are looking for something like:

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