Formula in Latex: How to use special symbols in Latex?

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I want to write following formula in Latex:



Formula



The problem is the "i" underneath "x". It is not a regular fraction. It means that value "x" will be replaced with "i". How can I write this one in Latex?
Additionally, the underlines are longer than the regular one which is used by typing "_". How can I modify the lenght of the underline?



 documentclass[12pt, a4paper]article
 usepackage[T1]fontenc 
 usepackage[utf8]inputenc 
 usepackage[english,ngerman]babel 
 usepackageamsmath,amsfonts,amssymb,amstext 

 begindocument
 $langle x,,underline,,,rangle_k,,langle underline,,,,x mapsto i,,underline,,,rangle_state$
 enddocument


Hopefully, you can help me.



Thanks in advance






math-mode underline







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  • I have edited my first post. There is the code.
    – user2379123
    2 hours ago










  • @user2379123 Can you undelete your previous question?
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up vote
2
down vote

favorite












I want to write following formula in Latex:



Formula



The problem is the "i" underneath "x". It is not a regular fraction. It means that value "x" will be replaced with "i". How can I write this one in Latex?
Additionally, the underlines are longer than the regular one which is used by typing "_". How can I modify the lenght of the underline?



 documentclass[12pt, a4paper]article
 usepackage[T1]fontenc 
 usepackage[utf8]inputenc 
 usepackage[english,ngerman]babel 
 usepackageamsmath,amsfonts,amssymb,amstext 

 begindocument
 $langle x,,underline,,,rangle_k,,langle underline,,,,x mapsto i,,underline,,,rangle_state$
 enddocument


Hopefully, you can help me.



Thanks in advance






math-mode underline







share|improve this question









New contributor




user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • Welcome to TeX.SE! Please show us the code you have so far ...
    – Kurt
    3 hours ago










  • Welcome! TikZ... do your work!!
    – manooooh
    3 hours ago










  • I have edited my first post. There is the code.
    – user2379123
    2 hours ago










  • @user2379123 Can you undelete your previous question?
    – egreg
    1 hour ago












up vote
2
down vote

favorite









up vote
2
down vote

favorite











I want to write following formula in Latex:



Formula



The problem is the "i" underneath "x". It is not a regular fraction. It means that value "x" will be replaced with "i". How can I write this one in Latex?
Additionally, the underlines are longer than the regular one which is used by typing "_". How can I modify the lenght of the underline?



 documentclass[12pt, a4paper]article
 usepackage[T1]fontenc 
 usepackage[utf8]inputenc 
 usepackage[english,ngerman]babel 
 usepackageamsmath,amsfonts,amssymb,amstext 

 begindocument
 $langle x,,underline,,,rangle_k,,langle underline,,,,x mapsto i,,underline,,,rangle_state$
 enddocument


Hopefully, you can help me.



Thanks in advance






math-mode underline







share|improve this question









New contributor




user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I want to write following formula in Latex:



Formula



The problem is the "i" underneath "x". It is not a regular fraction. It means that value "x" will be replaced with "i". How can I write this one in Latex?
Additionally, the underlines are longer than the regular one which is used by typing "_". How can I modify the lenght of the underline?



 documentclass[12pt, a4paper]article
 usepackage[T1]fontenc 
 usepackage[utf8]inputenc 
 usepackage[english,ngerman]babel 
 usepackageamsmath,amsfonts,amssymb,amstext 

 begindocument
 $langle x,,underline,,,rangle_k,,langle underline,,,,x mapsto i,,underline,,,rangle_state$
 enddocument


Hopefully, you can help me.



Thanks in advance






math-mode underline




math-mode underline






share|improve this question









New contributor




user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 hours ago





















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asked 3 hours ago









user2379123

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New contributor




user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






user2379123 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • Welcome to TeX.SE! Please show us the code you have so far ...
    – Kurt
    3 hours ago










  • Welcome! TikZ... do your work!!
    – manooooh
    3 hours ago










  • I have edited my first post. There is the code.
    – user2379123
    2 hours ago










  • @user2379123 Can you undelete your previous question?
    – egreg
    1 hour ago
















  • Welcome to TeX.SE! Please show us the code you have so far ...
    – Kurt
    3 hours ago










  • Welcome! TikZ... do your work!!
    – manooooh
    3 hours ago










  • I have edited my first post. There is the code.
    – user2379123
    2 hours ago










  • @user2379123 Can you undelete your previous question?
    – egreg
    1 hour ago















Welcome to TeX.SE! Please show us the code you have so far ...
– Kurt
3 hours ago




Welcome to TeX.SE! Please show us the code you have so far ...
– Kurt
3 hours ago












Welcome! TikZ... do your work!!
– manooooh
3 hours ago




Welcome! TikZ... do your work!!
– manooooh
3 hours ago












I have edited my first post. There is the code.
– user2379123
2 hours ago




I have edited my first post. There is the code.
– user2379123
2 hours ago












@user2379123 Can you undelete your previous question?
– egreg
1 hour ago




@user2379123 Can you undelete your previous question?
– egreg
1 hour ago










1 Answer
1






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Here's one idea. In the MWE, you can adjust the .7em specification to change the size of both the underscore and the mygap.



documentclassarticle
usepackagetabstackengine,amssymb
stackMath
newcommandudash[2][hrulefill]stackunder#2makebox[.7em]#1
newcommandmygapudash
begindocument
[
langletabbedShortunderstack
 udashx&mygap&udash\ i&&rangle_k 
 langleudashmygap x mapsto imygapudashrangle_mathrmstate
]
enddocument


enter image description here






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    1 Answer
    1






    active

    oldest

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    active

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    up vote
    2
    down vote













    Here's one idea. In the MWE, you can adjust the .7em specification to change the size of both the underscore and the mygap.



    documentclassarticle
    usepackagetabstackengine,amssymb
    stackMath
    newcommandudash[2][hrulefill]stackunder#2makebox[.7em]#1
    newcommandmygapudash
    begindocument
    [
    langletabbedShortunderstack
     udashx&mygap&udash\ i&&rangle_k 
     langleudashmygap x mapsto imygapudashrangle_mathrmstate
    ]
    enddocument


    enter image description here






    share|improve this answer


























      up vote
      2
      down vote













      Here's one idea. In the MWE, you can adjust the .7em specification to change the size of both the underscore and the mygap.



      documentclassarticle
      usepackagetabstackengine,amssymb
      stackMath
      newcommandudash[2][hrulefill]stackunder#2makebox[.7em]#1
      newcommandmygapudash
      begindocument
      [
      langletabbedShortunderstack
       udashx&mygap&udash\ i&&rangle_k 
       langleudashmygap x mapsto imygapudashrangle_mathrmstate
      ]
      enddocument


      enter image description here






      share|improve this answer
























        up vote
        2
        down vote










        up vote
        2
        down vote









        Here's one idea. In the MWE, you can adjust the .7em specification to change the size of both the underscore and the mygap.



        documentclassarticle
        usepackagetabstackengine,amssymb
        stackMath
        newcommandudash[2][hrulefill]stackunder#2makebox[.7em]#1
        newcommandmygapudash
        begindocument
        [
        langletabbedShortunderstack
         udashx&mygap&udash\ i&&rangle_k 
         langleudashmygap x mapsto imygapudashrangle_mathrmstate
        ]
        enddocument


        enter image description here






        share|improve this answer














        Here's one idea. In the MWE, you can adjust the .7em specification to change the size of both the underscore and the mygap.



        documentclassarticle
        usepackagetabstackengine,amssymb
        stackMath
        newcommandudash[2][hrulefill]stackunder#2makebox[.7em]#1
        newcommandmygapudash
        begindocument
        [
        langletabbedShortunderstack
         udashx&mygap&udash\ i&&rangle_k 
         langleudashmygap x mapsto imygapudashrangle_mathrmstate
        ]
        enddocument


        enter image description here







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited 2 hours ago

























        answered 2 hours ago









        Steven B. Segletes

        149k9188394




        149k9188394




















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