c is a set yes or no pls reply pls fast
Answers
YES, IT IS A SET
Spacing in maths mode is useful in several situations, let's see an example:
Assume we have the next sets
\[
S = \{ z \in \mathbb{C}\, |\, |z| < 1 \} \quad \textrm{and} \quad S_2=\partial{S}
\]
SpacingMathEx1.png
As you see in this example, a mathematical text can be explicitly spaced by means of some special commands
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Spaces
The spacing depends on the command you insert, the example below contains a complete list of spaces and how they look like.
Spaces in mathematical mode.
\begin{align*}
f(x) =& x^2\! +3x\! +2 \\
f(x) =& x^2+3x+2 \\
f(x) =& x^2\, +3x\, +2 \\
f(x) =& x^2\: +3x\: +2 \\
f(x) =& x^2\; +3x\; +2 \\
f(x) =& x^2\ +3x\ +2 \\
f(x) =& x^2\quad +3x\quad +2 \\
f(x) =& x^2\qquad +3x\qquad +2
\end{align*}
SpacingMathEx2.png
Check the reference guide for a description of the commands.
Note: to see a description of the align* environment see Aligning equations with amsmath
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Operators spacing
Spacing around operators and relations in math mode are governed by specific skip lengths:
\thinmuskip (by default it is equal to 3 mu)
\medmuskip (by default it is equal to 4 mu)
\thickmuskip (by default it is equal to 5 mu)
Answer: