InverseSeries[s] takes the series s, and gives a series for the inverse of the function represented by s. InverseSeries[s, x] uses the variable x in the inverse series.
KelvinBei[z] gives the Kelvin function bei(z).KelvinBei[n, z] gives the Kelvin function bei_n (z).
KelvinBer[z] gives the Kelvin function ber(z).KelvinBer[n, z] gives the Kelvin function ber_n (z).
KelvinKei[z] gives the Kelvin function kei(z).KelvinKei[n, z] gives the Kelvin function kei_n (z).
KelvinKer[z] gives the Kelvin function ker(z).KelvinKer[n, z] gives the Kelvin function ker_n (z).
LabelStyle is an option for formatting and related constructs that specifies the style to use in displaying their label-like elements.
LineSpacing is an option for Style and Cell that specifies the spacing between successive lines of text.
LogBarnesG[z] gives the logarithm of the Barnes G-function logG(z).
LogicalExpand[expr] expands out logical combinations of equations, inequalities, and other functions.
Message
(Built-in Mathematica Symbol) Message[symbol::tag] prints the message symbol::tag unless it has been switched off. Message[symbol::tag, e_1, e_2, ...] prints a message, inserting the values of the e_i as ...