Why won't this compile? Argument of h has an extra {












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documentclass{article}
usepackage{amsmath}

begin{document}
newcommand{x}[1][1]{ensuremath{a_{n-#1}}}
newcommand{e}[1][left(1+dfrac{1+sqrt{5}}{2}right)-left(dfrac{1-sqrt{5}}{2}right)^{n-2}left(1+dfrac{1-sqrt{5}}{2}right)]{ensuremath{\\=dfrac{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}#1}{sqrt{5}}}}
newcommand{f}{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{n-2}}}
newcommand{g}[1][n-1]{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{#1}}}
newcommand{h}[1][n-1]{ensuremath{left(dfrac{1+sqrt{5}}{2}right)^{#1}}}
newcommand{n}{ensuremath{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}}}



$a_n=x+x[2]e[-f+hg]ee[h[2]]$



end{document}









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    documentclass{article}
    usepackage{amsmath}

    begin{document}
    newcommand{x}[1][1]{ensuremath{a_{n-#1}}}
    newcommand{e}[1][left(1+dfrac{1+sqrt{5}}{2}right)-left(dfrac{1-sqrt{5}}{2}right)^{n-2}left(1+dfrac{1-sqrt{5}}{2}right)]{ensuremath{\\=dfrac{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}#1}{sqrt{5}}}}
    newcommand{f}{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{n-2}}}
    newcommand{g}[1][n-1]{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{#1}}}
    newcommand{h}[1][n-1]{ensuremath{left(dfrac{1+sqrt{5}}{2}right)^{#1}}}
    newcommand{n}{ensuremath{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}}}



    $a_n=x+x[2]e[-f+hg]ee[h[2]]$



    end{document}









    share|improve this question









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      documentclass{article}
      usepackage{amsmath}

      begin{document}
      newcommand{x}[1][1]{ensuremath{a_{n-#1}}}
      newcommand{e}[1][left(1+dfrac{1+sqrt{5}}{2}right)-left(dfrac{1-sqrt{5}}{2}right)^{n-2}left(1+dfrac{1-sqrt{5}}{2}right)]{ensuremath{\\=dfrac{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}#1}{sqrt{5}}}}
      newcommand{f}{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{n-2}}}
      newcommand{g}[1][n-1]{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{#1}}}
      newcommand{h}[1][n-1]{ensuremath{left(dfrac{1+sqrt{5}}{2}right)^{#1}}}
      newcommand{n}{ensuremath{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}}}



      $a_n=x+x[2]e[-f+hg]ee[h[2]]$



      end{document}









      share|improve this question









      New contributor




      Seven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      documentclass{article}
      usepackage{amsmath}

      begin{document}
      newcommand{x}[1][1]{ensuremath{a_{n-#1}}}
      newcommand{e}[1][left(1+dfrac{1+sqrt{5}}{2}right)-left(dfrac{1-sqrt{5}}{2}right)^{n-2}left(1+dfrac{1-sqrt{5}}{2}right)]{ensuremath{\\=dfrac{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}#1}{sqrt{5}}}}
      newcommand{f}{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{n-2}}}
      newcommand{g}[1][n-1]{ensuremath{left(dfrac{1-sqrt{5}}{2}right)^{#1}}}
      newcommand{h}[1][n-1]{ensuremath{left(dfrac{1+sqrt{5}}{2}right)^{#1}}}
      newcommand{n}{ensuremath{left(dfrac{1+sqrt{5}}{2}right) ^{n-2}}}



      $a_n=x+x[2]e[-f+hg]ee[h[2]]$



      end{document}






      compilation-error






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      share|improve this question




      share|improve this question








      edited yesterday







      Seven













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      asked yesterday









      SevenSeven

      384




      384




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          2 Answers
          2






          active

          oldest

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          6














          use



          e[{h[n-1]}] 


          Put the inner h[..] into braces






          share|improve this answer































            4














            If you define commands with optional argument through xparse, then you can nest them.



            documentclass{article}
            usepackage{amsmath}
            usepackage{xparse}

            newcommand{grplus}{dfrac{1+sqrt{5}}{2}}
            newcommand{grminus}{dfrac{1-sqrt{5}}{2}}

            newcommand{eopt}{%
            left(1+grplusright)-fleft(1+grminusright)%
            }

            NewDocumentCommand{x}{O{1}}{a_{n-#1}}
            NewDocumentCommand{e}{O{eopt}}{\&=dfrac{n #1}{sqrt{5}}}

            NewDocumentCommand{g}{O{n-1}}{left(grminusright)^{#1}}
            NewDocumentCommand{h}{O{n-1}}{left(grplusright)^{#1}}

            newcommand{n}{g[n-2]}
            newcommand{f}{h[n-2]}

            begin{document}

            $begin{aligned}[t]
            a_n&=x+x[2]e[-f+hg]ee[h[2]]
            end{aligned}$


            I also used aligned in order to get a better alignment.



            enter image description here



            There's no reason for plaguing you code with useless ensuremath.






            share|improve this answer























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              2 Answers
              2






              active

              oldest

              votes








              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              6














              use



              e[{h[n-1]}] 


              Put the inner h[..] into braces






              share|improve this answer




























                6














                use



                e[{h[n-1]}] 


                Put the inner h[..] into braces






                share|improve this answer


























                  6












                  6








                  6







                  use



                  e[{h[n-1]}] 


                  Put the inner h[..] into braces






                  share|improve this answer













                  use



                  e[{h[n-1]}] 


                  Put the inner h[..] into braces







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered yesterday









                  HerbertHerbert

                  276k25419732




                  276k25419732























                      4














                      If you define commands with optional argument through xparse, then you can nest them.



                      documentclass{article}
                      usepackage{amsmath}
                      usepackage{xparse}

                      newcommand{grplus}{dfrac{1+sqrt{5}}{2}}
                      newcommand{grminus}{dfrac{1-sqrt{5}}{2}}

                      newcommand{eopt}{%
                      left(1+grplusright)-fleft(1+grminusright)%
                      }

                      NewDocumentCommand{x}{O{1}}{a_{n-#1}}
                      NewDocumentCommand{e}{O{eopt}}{\&=dfrac{n #1}{sqrt{5}}}

                      NewDocumentCommand{g}{O{n-1}}{left(grminusright)^{#1}}
                      NewDocumentCommand{h}{O{n-1}}{left(grplusright)^{#1}}

                      newcommand{n}{g[n-2]}
                      newcommand{f}{h[n-2]}

                      begin{document}

                      $begin{aligned}[t]
                      a_n&=x+x[2]e[-f+hg]ee[h[2]]
                      end{aligned}$


                      I also used aligned in order to get a better alignment.



                      enter image description here



                      There's no reason for plaguing you code with useless ensuremath.






                      share|improve this answer




























                        4














                        If you define commands with optional argument through xparse, then you can nest them.



                        documentclass{article}
                        usepackage{amsmath}
                        usepackage{xparse}

                        newcommand{grplus}{dfrac{1+sqrt{5}}{2}}
                        newcommand{grminus}{dfrac{1-sqrt{5}}{2}}

                        newcommand{eopt}{%
                        left(1+grplusright)-fleft(1+grminusright)%
                        }

                        NewDocumentCommand{x}{O{1}}{a_{n-#1}}
                        NewDocumentCommand{e}{O{eopt}}{\&=dfrac{n #1}{sqrt{5}}}

                        NewDocumentCommand{g}{O{n-1}}{left(grminusright)^{#1}}
                        NewDocumentCommand{h}{O{n-1}}{left(grplusright)^{#1}}

                        newcommand{n}{g[n-2]}
                        newcommand{f}{h[n-2]}

                        begin{document}

                        $begin{aligned}[t]
                        a_n&=x+x[2]e[-f+hg]ee[h[2]]
                        end{aligned}$


                        I also used aligned in order to get a better alignment.



                        enter image description here



                        There's no reason for plaguing you code with useless ensuremath.






                        share|improve this answer


























                          4












                          4








                          4







                          If you define commands with optional argument through xparse, then you can nest them.



                          documentclass{article}
                          usepackage{amsmath}
                          usepackage{xparse}

                          newcommand{grplus}{dfrac{1+sqrt{5}}{2}}
                          newcommand{grminus}{dfrac{1-sqrt{5}}{2}}

                          newcommand{eopt}{%
                          left(1+grplusright)-fleft(1+grminusright)%
                          }

                          NewDocumentCommand{x}{O{1}}{a_{n-#1}}
                          NewDocumentCommand{e}{O{eopt}}{\&=dfrac{n #1}{sqrt{5}}}

                          NewDocumentCommand{g}{O{n-1}}{left(grminusright)^{#1}}
                          NewDocumentCommand{h}{O{n-1}}{left(grplusright)^{#1}}

                          newcommand{n}{g[n-2]}
                          newcommand{f}{h[n-2]}

                          begin{document}

                          $begin{aligned}[t]
                          a_n&=x+x[2]e[-f+hg]ee[h[2]]
                          end{aligned}$


                          I also used aligned in order to get a better alignment.



                          enter image description here



                          There's no reason for plaguing you code with useless ensuremath.






                          share|improve this answer













                          If you define commands with optional argument through xparse, then you can nest them.



                          documentclass{article}
                          usepackage{amsmath}
                          usepackage{xparse}

                          newcommand{grplus}{dfrac{1+sqrt{5}}{2}}
                          newcommand{grminus}{dfrac{1-sqrt{5}}{2}}

                          newcommand{eopt}{%
                          left(1+grplusright)-fleft(1+grminusright)%
                          }

                          NewDocumentCommand{x}{O{1}}{a_{n-#1}}
                          NewDocumentCommand{e}{O{eopt}}{\&=dfrac{n #1}{sqrt{5}}}

                          NewDocumentCommand{g}{O{n-1}}{left(grminusright)^{#1}}
                          NewDocumentCommand{h}{O{n-1}}{left(grplusright)^{#1}}

                          newcommand{n}{g[n-2]}
                          newcommand{f}{h[n-2]}

                          begin{document}

                          $begin{aligned}[t]
                          a_n&=x+x[2]e[-f+hg]ee[h[2]]
                          end{aligned}$


                          I also used aligned in order to get a better alignment.



                          enter image description here



                          There's no reason for plaguing you code with useless ensuremath.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered yesterday









                          egregegreg

                          727k8819223231




                          727k8819223231






















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