amsmathamssymbmath-mode
I have read that \ge and \geq are the same, but I have also seen \geqslant in various contexts before. What is the preference between \ge (AKA \geq) and \geqslant? Similarly, what is the preference between \le (AKA \leq) and \leqslant?
EDIT: I am aware that \le and \leq are the same, and similarly with \ge and \geq. My question is about the preference between using those and \leqslant & \geqslant.
First of all don't use align* for a single object and prefer equation*.
Simple commutative diagrams with the CD environment can have arrows pointing
right
@>>>
left
@<<<
down
@VVV
up
@AAA
double stem, no arrow head
@=
nothing (for filling blanks)
@.
However CD doesn't allow for "double arrows" and you have to go to a more specialized package. For instance xy:
\documentclass{article}
\usepackage{amsmath}
\usepackage[all,cmtip]{xy}
\begin{document}
\begin{equation*}
\xymatrix{
W \ar[r]^{\phi} \ar@<-2pt>[d]_{a} & X \ar@<-2pt>[d]_{c} \\
Y\ar@<-2pt>[u]_{b} \ar[r]^{\phi} & Z \ar@<-2pt>[u]_{d}
}
\end{equation*}
\end{document}
No. That quote is not correct.
In Plain TeX, \le is let to \leq and \ge is let to \geq, so they are equivalent.
The LaTeX kernel contains the following lines:
\DeclareMathSymbol{\leq}{\mathrel}{symbols}{"14}
\let\le=\leq
\DeclareMathSymbol{\geq}{\mathrel}{symbols}{"15}
\let\ge=\geq
so the pairs \le,\leq, and \ge, \geq are equivalent in standard LaTeX.
As you can see, \ge and \geq are just different names for the same object (and similarly for \le and \leq). Both \ge and \geq stand for "greater than or equal to" and both \le and \leq stand for "less than or equal to".
Best Answer
The symbols
\leq(\le) and\leqslanthave exactly the same meaning; similarly for\geq(\ge) and\geqslant. The preference for one or the other is basically subjective, but this is also affected by the house styles of major publishers of mathematics, which presumably traces back to the founding editors of journals handled by those publishers.The four commands representing forms with horizontal equal member are all defined in
plain.tex, and brought from there into LaTeX. This was a Knuth decision; the reason isn't known, but may be a desire to minimize typing. The slant forms were added inamsfontsby "popular demand", i.e., author pressure.All four shapes have unique Unicode ids. The slanted forms were added as part of the STIX effort, as requested by publishers.