Guide to LaTeX (4th Edition) (Tools and Techniques

12.2. Standard features of A M S-L AT E X 279
formulas as necessary. This command too takes an optional argument
num with possible values between 0 and 4 which make it progressively
easier for automatic page breaks to occur.
Once \allowdisplaybreaks has been given in the preamble, it is still
possible to suppress page breaks within a formula by ending an equation
line with \\* instead of with \\.
12.2.8 Package options for amsmath
The main amsmath package for A M S-L AT E X recognizes a number of options
that may be given when it is loaded with
\usepackage[options]{amsmath}
They are listed here as pairs with opposing effects. The member of
each pair that is assumed if neither is given, the default, is indicated by
underlining.
centertags | tbtags The equation number for a split environment
(page 272) is centered vertically by default. With tbtags, it is placed
either to the left of the first line or to the right of the last line,
depending on the side on which numbers are to appear.
sumlimits | nosumlimits In displayed formulas, initial and final limits
appear below and above the sign with the sumlimits option. With
nosumlimits, they are placed beside the sign, raised and lowered
with the usual ˆ and _ characters.
Other
symbols
that are
affected by these options are
and . On the other hand, integral signs are not
influenced by them.
sumlimits
∞
m−1
1
n!
= 2; n − i =
2n (n − m)!
n=0
i=0
nosumlimits
∞ 1
n=0 2n = 2; m−1 n!
n − i =
i=0 (n − m)!
The input text is the same for both of the above cases.
intlimits | nointlimits Integral signs normally have their limits at
the side; these options allow them to be placed above and below as
for summations.
intlimits
a
0
a 2 − x 2 dx =
1
0
a 2
1 − sin 2 t d sin t = a 2
π/2
cos 2 t dt = πa2
4
0