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I want to align the equations with text. Though the equations are aligned as I want it to be but still the text is not aligned.

 \mathscr{F}^\prime(x_0)^{-1}&\in L(Y,X) \quad &\textrm{for some } x_0\in{D}; \nonumber\\
\big\Vert{\mathscr{F}^\prime(x_0)^{-1}\mathscr{F}(x_0)}\big\Vert&\le {\color{red}\eta} &{}\nonumber
\big\Vert &\le L_0
\left\Vert{x-x_0}\right\Vert\quad &\textrm{for all } x\in{D}; \nonumber\\
\big\Vert &\le L
\left\Vert{x-y}\right\Vert\quad &\textrm{for all } x,y\in{D}; \nonumber\\
h_{AH} = \xoverline{L}_{\eta} &\le \dfrac{1}{2} &{}
\xoverline{U}(x_0,\lambda_0) &\subseteq D, &{}\nonumber

Another question: is there any way to write the preceding equations more aesthetically? Thank your response.

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Please add 4 more lines needed (\documentclass{...} to \end{document})to make it compilable MWE so that our wizards can directly copy/paste your code and start work on it. – percusse Sep 4 '12 at 8:04
up vote 7 down vote accepted

You should put the text in the fourth column, which is left aligned:



\let\xoverline\overline % supply your definition

  &\in L(Y,X)
  && \text{for some } x_0\in{D}; 
  &\le \textcolor{red}{\eta} 
  &\le L_0\lVert x-x_0\rVert 
  && \text{for all } x\in{D}; 
  &\le L\lVert x-y\rVert 
  &&\text{for all } x,y\in{D}; 
h_{AH} = \xoverline{L}_{\eta} 
  &\le \dfrac{1}{2}
  &\subseteq D, 

I've removed all the \big commands (which should be \bigl and \bigr for left and right delimiters, but don't seem necessary here). Instead I used \lVert and \rVert to state precisely the nature of the symbols, whether opening or closing delimiters. The shorthand ' is equivalent to ^{\prime}. Finally, \shortintertext from the mathtools package requires less vertical space than \intertext.

It's not clear what the number refers to, the whole alignment or just the central equation.

enter image description here

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Why are you using \dfrac for the last 1/2 fraction, doesn't \tfrac look better? – daleif Sep 4 '12 at 9:46
@daleif Possibly, but I like a big fraction better, in alignments; in this case \tfrac may be good for keeping the rythm of the lines. I didn't change that from the original input. – egreg Sep 4 '12 at 9:51
I usually recommend using \tfrac is the fraction is simple and is the only thing tall on the line – daleif Sep 5 '12 at 10:12
@egreg: I'm sorry to pester you like this, but I remember once asking you, in a comment, about the difference between \bigl/\bigr and just \big, i.e., when to use the one or the other, but I cannot for the life of me now find that answer you gave (I've searched my own profile's "responses"-tab as well as your username with query \left \bigl). Since this answer touches on the topic as well, could I ask for a reiteration? TIA! :-) – morbusg Feb 6 '13 at 7:55
\big produces an ordinary symbol, \bigl an opening symbol and \bigr) a closing one. This is relevant for spacing: try \log\big( and \log\bigl( to see the difference. – egreg Feb 6 '13 at 9:21

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