# List of mathematical symbols

The following mathematical symbols are used differently from Wikipedia:

Symbol Usage Interpretation Article LaTeX HTML Unicode
$\displaystyle{ \widehat{} }$ $\displaystyle{ \hat{a} }$ Reciprocal of $\displaystyle{ a }$: $\displaystyle{ 1/a }$ resp. $\displaystyle{ a^{-1} }$ for $\displaystyle{ a \ne 0 }$ (read as "hat") \widehat{} U+0302
$\displaystyle{ \acute{} }$ $\displaystyle{ \acute{a} }$ Increment of $\displaystyle{ a }$: $\displaystyle{ a - 1 }$ (read as "dec") \acute{} U+00B4
$\displaystyle{ \grave{} }$ $\displaystyle{ \grave{a} }$ Decrement of $\displaystyle{ a }$: $\displaystyle{ a + 1 }$ (read as "inc") \grave{} U+0060
$\displaystyle{ \nu }$ $\displaystyle{ {}^{\nu} A }$ greatest        finite number: intersection of the complex or real set $\displaystyle{ A }$ for $\displaystyle{ {}^{\nu}\mathbb{C} := [-\nu, \; \nu] + i[-\nu, \nu] }$ \nu &nu; U+03BD
$\displaystyle{ \omega }$ $\displaystyle{ {}^{\omega} A }$ greatest mid-finite number: intersection of the complex or real set $\displaystyle{ A }$ for $\displaystyle{ {}^{\omega}\mathbb{C} := [-\omega, \omega] + i[-\omega, \omega] }$ \omega &omega; U+03C9
$\displaystyle{ \varsigma }$ $\displaystyle{ \varsigma = \max \mathbb{R} }$ greatest real number \varsigma &varsigma; U+03C2
d0 d0 $\displaystyle{ = \min \mathbb{R}_{\gt 0} }$ smallest positive real number d0 d0
$\displaystyle{ {}_b }$ $\displaystyle{ {}_b a = \log_b a }$ Logarithm to base $\displaystyle{ b }$ for $\displaystyle{ a \in \mathbb{C} \setminus \mathbb{R}_{\le 0} }$ (read as "b in a") {}_b
$\displaystyle{ {}_1 }$ $\displaystyle{ {}_1 x = x/||x|| }$ Unit vector to $\displaystyle{ x \ne 0 }$ {}_1
$\displaystyle{ \iota }$ $\displaystyle{ \iota = \pi/2 }$ Quarter of the circumference that the unit circle has \iota &iota; U+03B9
$\displaystyle{ \tau }$ $\displaystyle{ \tau = 2\pi }$ Circumference that the unit circle has \tau &tau; U+03C4
$\displaystyle{ \infty }$ $\displaystyle{ \infty \gg \varsigma^2 }$ Replacing $\displaystyle{ \pm0 }$ by $\displaystyle{ \pm\hat{\infty} }$ Infinity \infty &infin; U+221E
$\displaystyle{ \mathbb M }$ $\displaystyle{ {\mathbb{M}}_{\mathbb{R}} = {}^{\omega}{\mathbb{R}} \setminus {}^{\nu}{\mathbb{R}} }$ mid-finite numbers: $\displaystyle{ {\mathbb{M}}_{\mathbb{C}} := {\mathbb{M}}_{\mathbb{R}} + i{\mathbb{M}}_{\mathbb{R}} }$ \mathbb{M} &Mopf; U+1D544
$\displaystyle{ {}^{\dot{}} }$ $\displaystyle{ \dot{A} }$ point-symmetric set $\displaystyle{ A }$ \dot &dot; U+02D9
$\displaystyle{ {}^{\ll} }$ $\displaystyle{ A^{\ll} }$ Set $\displaystyle{ A }$ without boundary $\displaystyle{ \partial A }$ given by min $\displaystyle{ \{d(x, y) : x \in A°, y \in A^{\prime}\} = \hat{\nu} }$ {}^{\ll} &ll; U+226A
$\displaystyle{ ' }$ $\displaystyle{ A' }$ Complement of the set $\displaystyle{ A }$ Complement (set theory) ' U+0027
$\displaystyle{ \curvearrowleft }$ $\displaystyle{ \curvearrowleft {a} }$ Predecessor of $\displaystyle{ a }$ (read as "pre") \curvearrowleft U+21B6
$\displaystyle{ \curvearrowright }$ $\displaystyle{ \curvearrowright {a} }$ Successor of $\displaystyle{ a }$ (read as "post") \curvearrowright U+21B7
$\displaystyle{ \Box }$ End of proof \Box U+25A1
$\displaystyle{ \triangle }$ End of definition \triangle &Delta; U+2206