Notations I

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$\mathbf{I}$: unit matrix; Common Notations and Definitions
$\Im$: imaginary part; 1.9.2
$I^{\NVar{\alpha}}$: fractional integral; 1.15.47
$I(\NVar{\mathbf{m}})$: general elliptic integral; §19.29(ii)
$\widetilde{I}_{\NVar{\nu}}\left(\NVar{x}\right)$: modified Bessel function of the first kind of imaginary order; 10.45.2
$I_{\NVar{\nu}}\left(\NVar{z}\right)$: modified Bessel function of the first kind; 10.25.2
${\mathsf{i}^{(1)}_{\NVar{n}}}\left(\NVar{z}\right)$: modified spherical Bessel function; 10.47.7
${\mathsf{i}^{(2)}_{\NVar{n}}}\left(\NVar{z}\right)$: modified spherical Bessel function; 10.47.8
$I_{\NVar{x}}\left(\NVar{a},\NVar{b}\right)$: incomplete beta function; 8.17.2
$I(\NVar{a},\NVar{b},\NVar{x})=I_{x}\left(a,b\right)$: notation used by Magnus et al. (1966); §8.1
(with $I_{\NVar{x}}\left(\NVar{a},\NVar{b}\right)$ : incomplete beta function)

$\mathrm{idem}\left(\NVar{\chi_{1}};\NVar{\chi_{2},\dots,\chi_{n}}\right)$: $\mathrm{idem}$ function; §17.1
$\mathrm{Ie}_{\NVar{n}}\left(\NVar{z},\NVar{h}\right)$: modified Mathieu function; 28.20.17
$\mathop{\mathrm{i}^{\NVar{n}}\mathrm{erfc}}\left(\NVar{z}\right)$: repeated integrals of the complementary error function; 7.18.2
$\mathrm{in}_{\NVar{n}}(\NVar{z},\NVar{q})=\mathrm{fe}_{n}\left(z,q\right)$: notation used by Campbell (1955); §28.1
(with $\mathrm{fe}_{\NVar{n}}\left(\NVar{z},\NVar{q}\right)$ : second solution, Mathieu’s equation)
$\inf$: greatest lower bound (infimum); Common Notations and Definitions
$\mathrm{inh}_{\NVar{n}}(\NVar{z},\NVar{q})=\mathrm{Fe}_{n}\left(z,q\right)$: notation used by Campbell (1955); §28.1
(with $\mathrm{Fe}_{\NVar{n}}\left(\NVar{z},\NVar{q}\right)$ : modified Mathieu function)
$\mathrm{inv}$: inversion number; §26.14(i)
$\operatorname{inverf}\NVar{x}$: inverse error function; 7.17.1
$\operatorname{inverfc}\NVar{x}$: inverse complementary error function; 7.17.1
$\mathrm{Io}_{\NVar{n}}\left(\NVar{z},\NVar{h}\right)$: modified Mathieu function; 28.20.18