LinearSolve[m, b] finds an x which solves the matrix equation m.x == b. LinearSolve[m] generates a LinearSolveFunction[...] which can be applied repeatedly to different b.

LinebreakAdjustments is an option for selections that sets parameters used for calculating where automatic line breaks should be inserted.

LineBreakChart[{{date_1, p_1}, {date_2, p_2}, ...}] makes a line break chart with prices p_i at date date_i.LineBreakChart[{" name", daterange}] makes a line break chart of ...

LineBreakWithin is an option for selections that specifies whether line breaks occur automatically when the end of a line is reached.

LineIndentMaxFraction is an option for Cell, StyleBox, and Style that specifies the maximum fraction of the total page width to indent at the beginnings of lines.

LineIndent is an option for Style and Cell that specifies how many ems of indentation to add at the beginnings of lines for each level of nesting in an expression.

LineIntegralConvolutionPlot[{{v_x, v_y}, image}, {x, x_min, x_max}, {y, y_min, y_max}] generates a line integral convolution plot of image convolved with the vector field ...

LineIntegralConvolutionScale is an option to LineIntegralConvolutionPlot and related functions that determines the scale of the line integral convolution to be used.

Line[{pt_1, pt_2, ...}] is a graphics primitive that represents a line joining a sequence of points. Line[{{pt_11, pt_12, ...}, {pt_21, ...}, ...}] represents a collection of ...

LineSpacing is an option for Style and Cell that specifies the spacing between successive lines of text.