! LaTeX Error: Option clash for package amsmath.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.10 \parindent
=1cm % абзацный отступ
The package amsmath has already been loaded with options:
[]
There has now been an attempt to load it with options
[fleqn]
Adding the global options:
,fleqn
to your \documentclass declaration may fix this.
Try typing <return> to proceed.
! Undefined control sequence.
<argument> \mathindent
l.11 \setlength{\mathindent}{1\parindent}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.11 \setlength{\mathindent}{1\parindent}
You're in trouble here. Try typing <return> to proceed.
If that doesn't work, type X <return> to quit.
! Missing number, treated as zero.
<to be read again>
\relax
l.11 \setlength{\mathindent}{1\parindent}
A number should have been here; I inserted `0'.
(If you can't figure out why I needed to see a number,
look up `weird error' in the index to The TeXbook.)
! Illegal unit of measure (pt inserted).
<to be read again>
\relax
l.11 \setlength{\mathindent}{1\parindent}
Dimensions can be in units of em, ex, in, pt, pc,
cm, mm, dd, cc, nd, nc, bp, or sp; but yours is a new one!
I'll assume that you meant to say pt, for printer's points.
To recover gracefully from this error, it's best to
delete the erroneous units; e.g., type `2' to delete
two letters. (See Chapter 27 of The TeXbook.)
