>>3618919>So they made mathematical projections without variablesHow can you prove that it was variable and not a fact?
"This report derives and defines a set of linearized system matrices for rigid aircraft of constant mass, flying in a stationary atmosphere over a flat, nonrotating earth...
This derivation of a linear model is general and makes NO ASSUMPTIONS on either the reference (nomial) trajectory about which the model is linearized or the symmetry of the vehicle mass and aerodynamic properties."