Mathematica is a very intelligent and powerful math software. I use it in my study and research a lot. Mathematica's ability to take derivative and to calculate limit is obvious powerful–way much beyond many mathematician's ability. Mathematica's ability to calculate integral is also powerful. There are many integrals than …

1. The parskip command makes a skip between paragraphs. The length of skip can be set using the command \setlength, e.g.,

   \setlength{\parskip}{15pt plus 1pt minus 1pt}
   

2. The command \itemsep sets the space between items in lists, e.g.,

   \begin{itemize}
   \itemsep = 0.8cm
   \item 
   \end{itemize}
   

3. The …

1. xetex is the state-of-art way for dealing with Chinese type setting. You can install xetex on Debian series of Linux distributions (Debian, Ubuntu, Linux Mint, etc.) using the following command.

wajig install texlive-xetex 

You can use command xelatex to compile. The utf-8 format is preferred.

There are 2 good ways …

1. LaTeX
   • If your LaTeX code contains only EPS figures, you can use the latex command (also OK to use pdflatex) to compile your code.
   • If you use bibtex, you have to compile your code using commands latex, bibtex, latex and latex in sequence.
   • If you use the psfrag package to …

1. Generally PDF figures are preferred for LaTeX code.

2. There are many useful commands in Linux for converting between different types of figures, e.g., convert, pdf2ps, etc. So it does not matter much which types of figures you produce. You can always convert them into other format when needed.

3. The …

See the following code.

String email = "test@test.com";
Pattern p = Pattern.compile(".+@.+\\.[a-z]+");
Matcher m = p.matcher(email);
boolean matchFound = m.matches();
if(matchFound){
    System.out.println("EMAIL OK");
}else{
    System.out.println("EMAIL ERROR");
}