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Heh my language is polish, but my problem is gone;) Your code, which you write here help me. Earlier I don't cancel something. So thanks a lot, I tire which this from few days, and now it work! Thanks a lot again:)

I don't know English language very well so I don't know what is your problem?!
So i can't read your link. Maybe you don't understand what i need in my document?

Ok it's work in new file. When I copy to my preamble my ckd. it's ok, it's in last line of proof, but my proof it's look like this:
Proof::
I don't know why it's ona more colon, only the first proof it's ok it's Proof:
but next all proof it's like this Proof::
And I can't use this \usepackage{babel ...

Does anyone know how can I write "Proof" in normal letters, not cursive? And with colon, I mean "Proof:". And concurrently end mark "ckd." in the last line of a proof? I use the report class. This is my preamble:
\documentclass[12pt,a4paper,oneside]{report}
\linespread{1.3}
\usepackage[utf8 ...

Ok never mind, how can I write "Proof:"
I write this , but I see "Proof:."
How can I delete "."?

I know it's something wrong, because in first proof it's work, but in the next proof, irrespective of the proof is end by text or displayed math, the end mark is in the next line.
Example:
\begin{proof}
Ponieważ $d$ jest funkcją multiplikatywną, więc
\begin{displaymath}
d(n)=d\left( \prod_{i=1}^{s ...

Sory, I want mark ckd. to the end of proof not a box, so I write this:
\renewcommand{\qedsymbol}{ckd.}
And I want a colon after a word "proof", it's mean "Proof:".
I write this:
\renewenvironment{proof}{\noindent Proof:}{\hfill ckd.}
but then my "ckd." was at next line. I write \qedhere to move ...

This is my preamble:
\documentclass[12pt,a4paper,oneside]{report}
\linespread{1.3}
\usepackage[utf8]{inputenc}
\usepackage{polski}
\usepackage[T1]{fontenc}
\usepackage{indentfirst}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{color}
\newtheorem{tw}{Twierdzenie}[chapter]
\newtheorem{lem ...

Thanks:)

Who know? Please help:-)