 solut laminar boundari layer equat solut laminar boundari layer equat problem flow flat plate edgewis steadi stream retard pressur gradient vari linearli distanc lead edg plate superpos discuss denot distanc measur perpendicular plate solut form power seri coeffici function differenti equat coeffici coeffici reason accuraci eighth ninth roughli appear term requir carri solut point separ work involv determin prohibit approxim method develop determin error term seri approxim method lead determin point separ agreement posit veloc edg boundari layer lead edg plate veloc gradient separ method develop solut boundari layer equat retard region replac veloc distribut edg boundari layer circumscrib polygon infinitesim side appli preced solut side make momentum integr continu vortex problem reduc solut order differenti equat 