\input texinfo @c -*-texinfo-*-

@node Top
@top Tests

@displaymath
\leqalignno{
   \int v(t)\, dt &= u(t) + C&[3.1]\cr
   \int v(t)\, dt &= u(t) + H&[3.2]\cr
}
@end displaymath

@tex
$$\leqalignno{
   \int v(t)\, dt &= u(t) + C&[3.1]\cr
   \int v(t)\, dt &= u(t) + H&[3.2]\cr
}$$
@end tex

@bye