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gauss^2
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When I write something in LaTeX, I always try to create shortcuts for things I use a lot, so my code looks has semantically meaningful constructions like \[\CountableUnion{U_n}{n}\] instead of complicated strings of symbols like \[\bigcup_{n=1}^{\infty}U_n\], for example. I have run into a difficulty in trying to create something to express sets with constraints such as the set B_N in the image below:
[PLAIN]http://img401.imageshack.us/img401/6616/screenshot1rg.png
The code I used for that B_N is
where \Defined{a}{b} is translated to a := b and \SetWithContraint{The_set}{The_constraint} is translated to { The_set | The_constraint }. The command \SetWithConstraint is defined in my preamble as:
My main problem is sizing that center bar | between the set to draw elements from and the constraint the elements must satisfy. As I have it set up right now, its size is determined by the height of the expression in the constraint area (e.g., the expression on the rhs). However, this looks very bad on something like the set K' in the image below, where the expression on the lhs is taller:
[PLAIN]http://img199.imageshack.us/img199/445/screenshottc.png
The relevant code there is
where \LimitPoints{K} displays K'. Does anyone know how to size this middle bar | in the \SetWithConstraint command I defined so that it will match the maximum of the height of the expression on the lhs and height of the expression on the rhs? Thanks!
[PLAIN]http://img401.imageshack.us/img401/6616/screenshot1rg.png
The code I used for that B_N is
Code:
Let us define the countable collection of sets $\CountableCollection{B_N}$ by
\[
\Defined
{B_N}
{\SetWithConstraint
{
\SetMember
{
\FiniteSum{a_i x^{n-i}}{i}{0}{n}
}
{
\Polynomials{\Integers}{x}
}
}
{
\FiniteSum{\AbsoluteValue{a_i}}{i}{0}{n} \neq 0
\quad\text{and}\quad n +
\FiniteSum{\AbsoluteValue{a_i}}{i}{0}{n} = N
}
}
\]
where \Defined{a}{b} is translated to a := b and \SetWithContraint{The_set}{The_constraint} is translated to { The_set | The_constraint }. The command \SetWithConstraint is defined in my preamble as:
Code:
\newcommand{\SetWithConstraint}[2]{\left\{\,#1\ \left|\ #2\,\right.\right\}}
My main problem is sizing that center bar | between the set to draw elements from and the constraint the elements must satisfy. As I have it set up right now, its size is determined by the height of the expression in the constraint area (e.g., the expression on the rhs). However, this looks very bad on something like the set K' in the image below, where the expression on the lhs is taller:
[PLAIN]http://img199.imageshack.us/img199/445/screenshottc.png
The relevant code there is
Code:
Hence, we have now shown that $x$ is a limit point of $K$ if and only if
$x = 0$ or there is an integer $m > 0$ with $x = 1/m$. In other words,
\[
\LimitPoints{K} =
\Union
{\Singleton{0}}
{\SetWithConstraint{\frac{1}{m}}{\SetMember{m}{\PositiveIntegers}}}
\]
where \LimitPoints{K} displays K'. Does anyone know how to size this middle bar | in the \SetWithConstraint command I defined so that it will match the maximum of the height of the expression on the lhs and height of the expression on the rhs? Thanks!
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