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Labelling equations with eqnarray

Place numbering in systeme package to the leftaligning a multiline formula with the bullet of itemizeHow can I number a few equations togetherAligning several '=' symbols across two linesAlign multiple equations with parts inside rootRight align a line in align-environmentHow can I align equations to the left and to the right?Align different equations on different equal signshorizontally align two minipages with matrizesVertical alignment of different systems of equationsAlign doesn´t align equations at equal sign

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

I would like to produce the following output:

To be precise, I would like the two equations to be aligned as produced by eqnarray*, and the two labels L_1 and L_2 to also be aligned. I could use begin{array}{crcl} L_1& left side & = & right side end{array}, but then there is too much space before and after the = sign. I think I could adjust that space with some parameters, but I would like this to work also on a web page with MathJax, and in any case I feel there should be a better way to do it. The way I produced that output works but I don't feel is the right way to do it, here is what I did:

begin{eqnarray*}

 L_1: hspace{3.1ex} x+y&=&1\

 L_2: hspace{1ex} 2x+2y&=&2

 end{eqnarray*}

vertical-alignment align eqnarray

share|improve this question

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You shouldn't use eqnarray – the spacing around the = signs is not good.
  
  – Bernard
  9 hours ago
  

  
  
  
  

add a comment | 

1

I would like to produce the following output:

To be precise, I would like the two equations to be aligned as produced by eqnarray*, and the two labels L_1 and L_2 to also be aligned. I could use begin{array}{crcl} L_1& left side & = & right side end{array}, but then there is too much space before and after the = sign. I think I could adjust that space with some parameters, but I would like this to work also on a web page with MathJax, and in any case I feel there should be a better way to do it. The way I produced that output works but I don't feel is the right way to do it, here is what I did:

begin{eqnarray*}

 L_1: hspace{3.1ex} x+y&=&1\

 L_2: hspace{1ex} 2x+2y&=&2

 end{eqnarray*}

vertical-alignment align eqnarray

share|improve this question

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You shouldn't use eqnarray – the spacing around the = signs is not good.
  
  – Bernard
  9 hours ago
  

  
  
  
  

add a comment | 

I would like to produce the following output:

To be precise, I would like the two equations to be aligned as produced by eqnarray*, and the two labels L_1 and L_2 to also be aligned. I could use begin{array}{crcl} L_1& left side & = & right side end{array}, but then there is too much space before and after the = sign. I think I could adjust that space with some parameters, but I would like this to work also on a web page with MathJax, and in any case I feel there should be a better way to do it. The way I produced that output works but I don't feel is the right way to do it, here is what I did:

begin{eqnarray*}

 L_1: hspace{3.1ex} x+y&=&1\

 L_2: hspace{1ex} 2x+2y&=&2

 end{eqnarray*}

vertical-alignment align eqnarray

share|improve this question

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

begin{eqnarray*}

 L_1: hspace{3.1ex} x+y&=&1\

 L_2: hspace{1ex} 2x+2y&=&2

 end{eqnarray*}

share|improve this question

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

share|improve this question

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

edited 6 hours ago

Zarko

138k88 gold badges7575 silver badges184184 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

asked 9 hours ago

Valerio De AngelisValerio De Angelis

3344 bronze badges

2 Answers
2

active

oldest

votes

4

The alignat environment from amsmath gives you full control on the spacing between columns of equations:

documentclass{article}

 usepackage{amsmath}



begin{document}



begin{alignat*}{2}

 & L_1: & x+y &=1 \

 & L_2: & enspace 2x+2y&=2

end{alignat*}



end{document} 

share|improve this answer

edited 8 hours ago

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is just what I was looking for - and it works with MathJax too.
  
  – Valerio De Angelis
  3 hours ago
  

  
  
  
  

add a comment | 

3

Adapting the @Salim Bou's macro Place numbering in systeme package to the left, using systeme package, you can obtain, this little MWE with another similar result:

documentclass[a4paper,12pt]{article}

usepackage{systeme,mathtools}

newcommand{rightnum}[1]{syscodeextracol{kern-#1hfill$}{$kern#1}}

newcommand{leftnum}{syscodeextracol{kern1.5em$}{$}}% return to default

begin{document}

sysdelim..

rightnum{7.5em}

[systeme{x+y=1 @{L_1:}, 2x+2y=2 @{L_2:}}]

end{document}

share|improve this answer

edited 6 hours ago

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

add a comment | 

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4

The alignat environment from amsmath gives you full control on the spacing between columns of equations:

documentclass{article}

 usepackage{amsmath}



begin{document}



begin{alignat*}{2}

 & L_1: & x+y &=1 \

 & L_2: & enspace 2x+2y&=2

end{alignat*}



end{document} 

share|improve this answer

edited 8 hours ago

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is just what I was looking for - and it works with MathJax too.
  
  – Valerio De Angelis
  3 hours ago
  

  
  
  
  

add a comment | 

4

The alignat environment from amsmath gives you full control on the spacing between columns of equations:

documentclass{article}

 usepackage{amsmath}



begin{document}



begin{alignat*}{2}

 & L_1: & x+y &=1 \

 & L_2: & enspace 2x+2y&=2

end{alignat*}



end{document} 

share|improve this answer

edited 8 hours ago

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  This is just what I was looking for - and it works with MathJax too.
  
  – Valerio De Angelis
  3 hours ago
  

  
  
  
  

add a comment | 

The alignat environment from amsmath gives you full control on the spacing between columns of equations:

documentclass{article}

 usepackage{amsmath}



begin{document}



begin{alignat*}{2}

 & L_1: & x+y &=1 \

 & L_2: & enspace 2x+2y&=2

end{alignat*}



end{document} 

share|improve this answer

edited 8 hours ago

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

documentclass{article}

 usepackage{amsmath}



begin{document}



begin{alignat*}{2}

 & L_1: & x+y &=1 \

 & L_2: & enspace 2x+2y&=2

end{alignat*}



end{document} 

share|improve this answer

edited 8 hours ago

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

answered 9 hours ago

BernardBernard

182k77 gold badges8383 silver badges216216 bronze badges

3

Adapting the @Salim Bou's macro Place numbering in systeme package to the left, using systeme package, you can obtain, this little MWE with another similar result:

documentclass[a4paper,12pt]{article}

usepackage{systeme,mathtools}

newcommand{rightnum}[1]{syscodeextracol{kern-#1hfill$}{$kern#1}}

newcommand{leftnum}{syscodeextracol{kern1.5em$}{$}}% return to default

begin{document}

sysdelim..

rightnum{7.5em}

[systeme{x+y=1 @{L_1:}, 2x+2y=2 @{L_2:}}]

end{document}

share|improve this answer

edited 6 hours ago

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

add a comment | 

3

Adapting the @Salim Bou's macro Place numbering in systeme package to the left, using systeme package, you can obtain, this little MWE with another similar result:

documentclass[a4paper,12pt]{article}

usepackage{systeme,mathtools}

newcommand{rightnum}[1]{syscodeextracol{kern-#1hfill$}{$kern#1}}

newcommand{leftnum}{syscodeextracol{kern1.5em$}{$}}% return to default

begin{document}

sysdelim..

rightnum{7.5em}

[systeme{x+y=1 @{L_1:}, 2x+2y=2 @{L_2:}}]

end{document}

share|improve this answer

edited 6 hours ago

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

add a comment | 

Adapting the @Salim Bou's macro Place numbering in systeme package to the left, using systeme package, you can obtain, this little MWE with another similar result:

documentclass[a4paper,12pt]{article}

usepackage{systeme,mathtools}

newcommand{rightnum}[1]{syscodeextracol{kern-#1hfill$}{$kern#1}}

newcommand{leftnum}{syscodeextracol{kern1.5em$}{$}}% return to default

begin{document}

sysdelim..

rightnum{7.5em}

[systeme{x+y=1 @{L_1:}, 2x+2y=2 @{L_2:}}]

end{document}

share|improve this answer

edited 6 hours ago

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

documentclass[a4paper,12pt]{article}

usepackage{systeme,mathtools}

newcommand{rightnum}[1]{syscodeextracol{kern-#1hfill$}{$kern#1}}

newcommand{leftnum}{syscodeextracol{kern1.5em$}{$}}% return to default

begin{document}

sysdelim..

rightnum{7.5em}

[systeme{x+y=1 @{L_1:}, 2x+2y=2 @{L_2:}}]

end{document}

share|improve this answer

edited 6 hours ago

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges

answered 6 hours ago

SebastianoSebastiano

13.2k55 gold badges2525 silver badges7171 bronze badges