Expression 141: phi equals StartFraction, 1 plus StartRoot, 5 , EndRoot Over 2 , EndFractionϕ=1+52
141
Expression 142: "F" left parenthesis, "n" , right parenthesis equals StartFraction, phi Superscript, "n" , Baseline minus left parenthesis, negative phi , right parenthesis Superscript, negative "n" , Baseline Over StartRoot, 5 , EndRoot , EndFractionFn=ϕn−−ϕ−n5
142
"i" Subscript, "d" , Baselineid
"x" Subscript, "l" "i" "s" "t" "f" , Baseline left bracket, "i" Subscript, "d" , Baseline , right bracket . "x"xlistfid.x