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"#note that at the max level curves of the objective function and t he constraint are parallel" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "Pl:=P-lambda*(x+y-10000);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#Pl G,.*&,(\"$R$\"\"\"*&$F)!\"#F)%\"xGF)!\"\"*&$\"\"$!\"$F)%\"yGF)F.F)F-F) F)*&,(\"$*RF)*&$\"\"%F2F)F-F)F.*&$F)F,F)F3F)F.F)F3F)F)\"'++SF.*&\"$&>F )F-F)F.*&\"$D#F)F3F)F.*&%'lambdaGF),(F-F)F3F)\"&++\"F.F)F." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "dPldx:=diff(Pl,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&dPldxG,**&$\"\"#!\"#\"\"\"%\"xGF*!\"\"$\"$W\"\" \"!F**&$\"\"(!\"$F*%\"yGF*F,%'lambdaGF," }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "dPldy:=diff(Pl,y);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6 #>%&dPldyG,**&$\"\"(!\"$\"\"\"%\"xGF*!\"\"*&$\"\"#!\"#F*%\"yGF*F,$\"$u \"\"\"!F*%'lambdaGF," }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "dPl dl:=diff(Pl,lambda);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&dPldlG,(%\" xG!\"\"%\"yGF'\"&++\"\"\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 46 "sols:=solve(\{dPldx,dPldy,dPldl\},\{x,y,lambda\});" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%solsG<%/%\"yG$\"+ah%Q:'!\"'/%\"xG$\"+YQ:YQF*/%' lambdaG$\"#C\"\"!" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "assign (sols);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 2 "P;" }}{PARA 11 " " 1 "" {XPPMATH 20 "6#$\"*#p2B`!\"$" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "unassign('x');" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "unassign('y');" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "u nassign('lambda');" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 40 "#star t over with a new constraint x=5000" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 65 "#we need to solve: max P, subject to y<=8000, y<=1000 0-5000=5000 " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 36 "#this impli es new constraint y<=5000" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "#form new function P1" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 15 "assign(x=5000);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "P1:= P-lambda*(y-5000);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#P1G,*$\"(+++( !\"#\"\"\"*&$\"'++C!\"$F)%\"yGF)!\"\"*&,&$\"'+!z$F-F)*&$F)F(F)F.F)F/F) F.F)F)*&%'lambdaGF),&F.F)\"%+]F/F)F/" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "dP1dy:=diff(P1,y);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6 #>%&dP1dyG,($\"'+!R\"!\"$\"\"\"*&$\"\"#!\"#F)%\"yGF)!\"\"%'lambdaGF/" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "dP1dl:=diff(P1,lambda);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&dP1dlG,&%\"yG!\"\"\"%+]\"\"\"" }} }{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 39 "sols1:=solve(\{dP1dy,dP1dl \},\{y,lambda\});" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&sols1G<$/%'lam bdaG$\"#R\"\"!/%\"yG$\"%+]F*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "assign(sols1);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 2 "P;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*+++:&!\"$" }}}{EXCHG {PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 70 "#we get a smaller value than before; other cas e can be done similarly " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "unassign('x');" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "unassign ('y');" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "unassign('lambda' );" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 51 "#Sensitivity with res pect to manufacturing capacity" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 69 "#Introduce new parameter and new form of the constraint: g(x,y )=x+y=c" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "#Set up constrai ned problem" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "Plc:=P-lambda*(x+y-c);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$PlcG,.*&,(\"$R$\"\"\"*&$F)!\"#F)%\"xGF)!\"\" *&$\"\"$!\"$F)%\"yGF)F.F)F-F)F)*&,(\"$*RF)*&$\"\"%F2F)F-F)F.*&$F)F,F)F 3F)F.F)F3F)F)\"'++SF.*&\"$&>F)F-F)F.*&\"$D#F)F3F)F.*&%'lambdaGF),(F-F) F3F)%\"cGF.F)F." }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 54 "#Find pa rtials with respect to x,y,lambda respectively" }}}{EXCHG {PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 20 "dPlcdx:=diff(Plc,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'dPlcdxG,**&$\"\"#!\"#\"\"\"%\"xGF*!\"\"$\"$W\"\"\"!F **&$\"\"(!\"$F*%\"yGF*F,%'lambdaGF," }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 20 "dPlcdy:=diff(Plc,y);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'dPlcdyG,**&$\"\"(!\"$\"\"\"%\"xGF*!\"\"*&$\"\"#!\"#F*%\"yGF*F,$ \"$u\"\"\"!F*%'lambdaGF," }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "dPlcdl:=diff(Plc,lambda);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'dPlcd lG,(%\"xG!\"\"%\"yGF'%\"cG\"\"\"" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 50 "solsc:=solve(\{dPlcdx,dPlcdy,dPlcdl\},\{x,y,lambda\}) ;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&solscG<%/%'lambdaG,&$\"$f\"\" \"!\"\"\"*&$\"++++]8!#6F,%\"cGF,!\"\"/%\"yG,&*&$\"+++++]!#5F,F1F,F,$\" +ah%Q:\"!\"'F,/%\"xG,&*&F7F,F1F,F,$\"+ah%Q:\"F " 0 "" {MPLTEXT 1 0 16 "dPdx:=diff(P,x);" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "dPdy:=diff(P,y);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#> %%dPdxG,(*&$\"\"#!\"#\"\"\"%\"xGF*!\"\"$\"$W\"\"\"!F**&$\"\"(!\"$F*%\" yGF*F," }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%dPdyG,(*&$\"\"(!\"$\"\"\" %\"xGF*!\"\"*&$\"\"#!\"#F*%\"yGF*F,$\"$u\"\"\"!F*" }}}{EXCHG {PARA 0 " > " 0 "" {MPLTEXT 1 0 14 "assign(solsc);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "dxdc:=diff(x,c);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#> %%dxdcG$\"+++++]!#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "dydc :=diff(y,c);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%dydcG$\"+++++]!#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "SPc:=dPdx*dxdc+dPdy*dydc; " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$SPcG,&*&$\"++++]8!#6\"\"\"%\"cG F*!\"\"$\"++++!f\"!\"(F*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 2 " P;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,**&,&$\"+I#p2Z$!\"(\"\"\"*&$\"+ ++++l!#7F)%\"cGF)!\"\"F),&*&$\"+++++]!#5F)F.F)F)$\"+ah%Q:\"!\"'F/F)F)* &,&$\"+J#p2#RF(F)*&$\"+++++qF-F)F.F)F/F),&*&F2F)F.F)F)$\"+ah%Q:\"F7F)F )F)$\"+YQ:YV!\"%F/*&$\"+++++@F(F)F.F)F/" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 16 "assign(c=10000);" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 2 "P;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*#p2B`!\"$" } }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 4 "SPc;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*+++S#!\"(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 92 "#lambda can be interpreted as the shadow (dual) price of a resou rce, in this case production" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "#capacity x+y" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 39 "#equ ality Spc=lambda is a general fact " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}}{MARK "43 1 0" 0 }{VIEWOPTS 1 1 0 1 1 1803 1 1 1 1 }{PAGENUMBERS 0 1 2 33 1 1 }