<a href="http://exp.frozenlib.net/query?exp=(%5cbegin%7bmatrix%7d+a+%26%26+b%2b1+%5c%5c+c%2b1+%26%26+d+%5cend%7bmatrix%7d)"><img src="http://exp.frozenlib.net/image?exp=(%5cbegin%7bmatrix%7d+a+%26%26+b%2b1+%5c%5c+c%2b1+%26%26+d+%5cend%7bmatrix%7d)&size=7&textcolor=000000FF&backcolor=FFFFFFFF" alt="(\begin{matrix} a && b+1 \\ c+1 && d \end{matrix})" style="border:none;" /></a>