Symbols:Q
quecto-
- $\mathrm q$
The Système Internationale d'Unités symbol for the metric scaling prefix quecto, denoting $10^{\, -30 }$, is $\mathrm { q }$.
Its $\LaTeX$ code is \mathrm {q} .
quetta-
- $\mathrm Q$
The Système Internationale d'Unités symbol for the metric scaling prefix quetta, denoting $10^{\, 30 }$, is $\mathrm { Q }$.
Its $\LaTeX$ code is \mathrm {Q} .
Set of Rational Numbers
- $\Q$
The set of rational numbers.
The $\LaTeX$ code for \(\Q\) is \Q or \mathbb Q or \Bbb Q.
Set of Non-Zero Rational Numbers
- $\Q_{\ne 0}$
The set of non-zero rational numbers:
- $\Q_{\ne 0} = \Q \setminus \left\{{0}\right\}$
The $\LaTeX$ code for \(\Q_{\ne 0}\) is \Q_{\ne 0} or \mathbb Q_{\ne 0} or \Bbb Q_{\ne 0}.
Set of Non-Negative Rational Numbers
- $\Q_{\ge 0}$
The set of non-negative rational numbers:
- $\Q_{\ge 0} = \set {x \in \Q: x \ge 0}$
The $\LaTeX$ code for \(\Q_{\ge 0}\) is \Q_{\ge 0} or \mathbb Q_{\ge 0} or \Bbb Q_{\ge 0}.
Set of Strictly Positive Rational Numbers
- $\Q_{> 0}$
The set of strictly positive rational numbers:
- $\Q_{> 0} = \set {x \in \Q: x > 0}$
The $\LaTeX$ code for \(\Q_{> 0}\) is \Q_{> 0} or \mathbb Q_{> 0} or \Bbb Q_{> 0}.
Probability
- $q$
Used in conjunction with the general probability $p$:
- $q = 1 - p$
As such, $q$ is a real number such that:
- $0 \le q \le 1$
and
- $p + q = 1$
The $\LaTeX$ code for \(q\) is q .
Parallactic Angle
- $q$
Used to denote the parallactic angle of a point on the celestial sphere.
Let $x$ be a point on the celestial sphere.
Let $\SS_1$ be the arc of the great circle between $x$ and the zenith.
Let $\SS_2$ be the arc of the great circle between $x$ and the north celestial pole.
The parallactic angle is defined as the (spherical) angle between $\SS_1$ and $\SS_2$.
The $\LaTeX$ code for \(q\) is q .
Quotient Mapping
- $q_\RR$
The quotient mapping induced by $\RR$:
- $q_\RR: S \to S / \RR: \map {q_\RR} s = \eqclass s {\RR}$
where:
- $\RR \subseteq S \times S$ be an equivalence relation on a set $S$
- $\eqclass s \RR$ is the $\RR$-equivalence class of $s$
- $S / \RR$ is the quotient set of $S$ determined by $\RR$.
Also known as:
- the canonical surjection from $S$ to $S / \RR$
- the canonical map or canonical projection from $S$ onto $S / \RR$
- the natural mapping from $S$ to $S / \RR$
- the natural surjection from $S$ to $S / \RR$
- the classifying map or classifying mapping (as it classifies the elements of $S$ into those various equivalence classes)
- the projection from $S$ to $S / \RR$
The $\LaTeX$ code for \(q_\RR: S \to S / \RR\) is q_\RR: S \to S / \RR .
Electric Charge
- $q$
The usual symbol used to denote the electric charge on a body is $q$.
Its $\LaTeX$ code is q .
Quart
- $\mathrm {qt}$
The symbol for the quart is $\mathrm {qt}$.
The $\LaTeX$ code for \(\mathrm {qt}\) is \mathrm {qt} .