Symbols:C
centi-
- $\mathrm c$
The Système Internationale d'Unités symbol for the metric scaling prefix centi, denoting $10^{\, -2 }$, is $\mathrm { c }$.
Its $\LaTeX$ code is \mathrm {c}
.
Speed of Light
- $c$
The speed of light (in a vacuum) is a physical constant.
Information cannot travel faster.
It is usually denoted $c$, and its value is given as:
- $c = 299 \, 792 \, 458 \text { m s}^{-1}$
exactly.
The metre is in fact defined in terms of the speed of light and the definition of the second.
Its $\LaTeX$ code is c
.
Hexadecimal
- $\mathrm C$ or $\mathrm c$
The hexadecimal digit $12$.
Its $\LaTeX$ code is \mathrm C
or \mathrm c
.
Roman Numeral
- $\mathrm C$ or $\mathrm c$
The Roman numeral for $100$.
Its $\LaTeX$ code is \mathrm C
or \mathrm c
.
Coulomb
- $\mathrm C$
The symbol for the coulomb is $\mathrm C$.
Its $\LaTeX$ code is \mathrm C
.
Set of Complex Numbers
- $\C$
The set of complex numbers.
The $\LaTeX$ code for \(\C\) is \C
or \mathbb C
or \Bbb C
.
Set of Non-Zero Complex Numbers
- $\C_{\ne 0}$
The set of non-zero complex numbers:
- $\C_{\ne 0} = \C \setminus \set 0$
The $\LaTeX$ code for \(\C_{\ne 0}\) is \C_{\ne 0}
or \mathbb C_{\ne 0}
or \Bbb C_{\ne 0}
.
Extended Complex Plane
- $\overline \C$
The extended complex plane $\overline \C$ is defined as:
- $\overline \C := \C \cup \set \infty$
that is, the set of complex numbers together with the point at infinity.
The $\LaTeX$ code for \(\overline \C\) is \overline \C
or \overline {\mathbb C}
or \overline {\Bbb C}
.
Relative Complement
- $\relcomp S T$ or $\map {\mathcal C_S} T$
Let $S$ be a set, and let $T \subseteq S$, that is: let $T$ be a subset of $S$.
Then the set difference $S \setminus T$ can be written $\relcomp S T$, and is called the relative complement of $T$ in $S$, or the complement of $T$ relative to $S$.
Thus:
- $\relcomp S T = \set {x \in S : x \notin T}$
The $\LaTeX$ code for \(\relcomp S T\) is \relcomp S T
.
The $\LaTeX$ code for \(\map {\mathcal C_S} T\) is \map {\mathcal C_S} T
.
Set Complement
- $\map \complement S$ or $\map {\mathcal C} S$
The set complement (or, when the context is established, just complement) of a set $S$ in a universe $\mathbb U$ is defined as:
- $\map \complement S = \relcomp {\mathbb U} S = \mathbb U \setminus S$
See the definition of Relative Complement for the definition of $\relcomp {\mathbb U} S$.
The $\LaTeX$ code for \(\map \complement S\) is \map \complement S
.
The $\LaTeX$ code for \(\map {\mathcal C} S\) is \map {\mathcal C} S
.
Hyperbolic Cosine
ch
- $\operatorname {ch}$
A variant of $\cosh$.
Its $\LaTeX$ code is \operatorname {ch}
.
Inverse Hyperbolic Cosine
ch${}^{-1}$
- $\operatorname {ch}^{-1}$
A variant of $\cosh^{-1}$.
Its $\LaTeX$ code is \operatorname {ch}^{-1}
.
Centimetre
- $\mathrm {cm}$
The symbol for the centimetre is $\mathrm {cm}$:
Its $\LaTeX$ code is \mathrm {cm}
.