quasi- linear theory

linear control theory

linear elastic theory

linear guadratic Gauss control theory

linear mountain wave theory

linear potential wave theory

Linear programming theory

linear radiation wave theory

linear wave theory

linear wave-making resistance theory

collision theory hard sphere theory

hard sphere theory collision theory

lipoid-sieve theory lipoid-filter theory

TRIZ theory of inventive problem solving theory

(Topological) Linear Sapce

0-1 linear integer problem

0-1 linear programming

1-D linear phase FIR digital filters

2 D linear extrapolated inspection