1\documentclass{article}
2
3\usepackage{amsmath} %% pkg required by EasyLatex
4\usepackage{amsfonts} %% pkg required by EasyLatex
5\usepackage{amssymb} %% pkg required by EasyLatex
6\usepackage{psfrag} %% pkg required by EasyLatex
7\usepackage{url} %% pkg required by EasyLatex
8\usepackage[dvips]{graphicx} %% pkg required by EasyLatex
9\begin{document}
10
11
12\begin{align*}
13a &\leq b
14\\b &\leq c
15\\a &\geq d
16\\a &= e
17\end{align*}
18
19
20\begin{align*}
21b &= c
22\\b &= d
23\end{align*}
24
25
26\begin{align*}
27a &= a
28\end{align*}
29
30
31\begin{align*}
32&&c(v_a v_b \ldots v_c, v_x v_y \ldots v_z)  + c(v_d v_e \ldots v_f, v_x v_y  \ldots v_z) &=  c(v_a v_b \ldots v_c v_d v_e \ldots v_f, v_x v_y  \ldots v_z)
33\\ \textrm{if $m \geq n$,  } &&  c(v_1 v_2 \ldots v_{n-1} v_n) &\geq c(v_1 v_2 \ldots v_{n-1} v_m)
34\\&& c(v_a v_b \ldots v_c, v_x v_y \ldots v_z) + c(v_d v_e \ldots v_f, v_q v_r  \ldots v_s) &\geq c(v_a v_b \ldots v_c, v_x v_y \ldots v_z)
35\end{align*}
36
37
38
39\begin{align*}
40&&a + b &= c
41\\ \textrm{if $m \geq n$,  } &&  d &\geq e
42\\&& f &\geq g
43\end{align*}
44
45
46
47
48\end{document}
49