book seperate

This is pdfTeX, Version 3.14159265-2.6-1.40.20 (MiKTeX 2.9.6960 64-bit) (preloaded format=pdflatex 2019.3.14)  15 MAR 2019 11:03
entering extended mode
**./main.tex
(main.tex
LaTeX2e <2018-12-01>
("C:\Users\HP 250\AppData\Local\Programs\MiKTeX 2.9\tex/latex/base\book.cls"
Document Class: book 2018/09/03 v1.4i Standard LaTeX document class
("C:\Users\HP 250\AppData\Local\Programs\MiKTeX 2.9\tex/latex/base\bk10.clo"
File: bk10.clo 2018/09/03 v1.4i Standard LaTeX file (size option)
)
\c@part=\count80
\c@chapter=\count81
\c@section=\count82
\c@subsection=\count83
\c@subsubsection=\count84
\c@paragraph=\count85
\c@subparagraph=\count86
\c@figure=\count87
\c@table=\count88
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\bibindent=\dimen102
)
("C:\Users\HP 250\AppData\Local\Programs\MiKTeX 2.9\tex/latex/amscls\amsthm.sty
"
Package: amsthm 2017/10/31 v2.20.4
\thm@style=\toks14
\thm@bodyfont=\toks15
\thm@headfont=\toks16
\thm@notefont=\toks17
\thm@headpunct=\toks18
\thm@preskip=\skip43
\thm@postskip=\skip44
\thm@headsep=\skip45
\dth@everypar=\toks19
)
\c@examp=\count89
 (main.aux (ch1.aux) (ch2.aux) (ch3.aux))
\openout1 = `main.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 8.
LaTeX Font Info:    ... okay on input line 8.
 [1{C:/Users/HP 250/AppData/Local/MiKTeX/2.9/pdftex/config/pdftex.map}

]
\openout2 = `ch1.tex.aux'.


No file ch1.tex.tex.
\openout2 = `ch2.tex.aux'.

No file ch2.tex.tex.
\openout2 = `ch3.tex.aux'.

No file ch3.tex.tex.
(main.aux (ch1.tex.aux) (ch2.tex.aux) (ch3.tex.aux)) )
Here is how much of TeX's memory you used:
 352 strings out of 492946
 4068 string characters out of 3125820
 60799 words of memory out of 3000000
 4311 multiletter control sequences out of 15000+200000
 3993 words of font info for 15 fonts, out of 3000000 for 9000
 1141 hyphenation exceptions out of 8191
 23i,4n,18p,144b,141s stack positions out of 5000i,500n,10000p,200000b,50000s
<C:/Users/HP 250/AppData/
Local/Programs/MiKTeX 2.9/fonts/type1/public/amsfonts/cm/cmr10.pfb>
Output written on main.pdf (1 page, 12466 bytes).
PDF statistics:
 10 PDF objects out of 1000 (max. 8388607)
 0 named destinations out of 1000 (max. 500000)
 1 words of extra memory for PDF output out of 10000 (max. 10000000)