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Package: kvsetkeys 2016/05/16 v1.17 Key value parser (HO)

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Package: etexcmds 2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
Package etexcmds Info: Could not find \expanded.
(etexcmds)             That can mean that you are not using pdfTeX 1.50 or
(etexcmds)             that some package has redefined \expanded.
(etexcmds)             In the latter case, load this package earlier.
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Package epstopdf-base Info: Redefining graphics rule for `.eps' on input line 4
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Package grfext Info: Graphics extension search list:
(grfext)             [.png,.pdf,.jpg,.mps,.jpeg,.jbig2,.jb2,.PNG,.PDF,.JPG,.JPE
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(grfext)             \AppendGraphicsExtensions on input line 456.

(/usr/local/texlive/2016/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg
File: epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Liv
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Capitolo 1
! Missing delimiter (. inserted).
<to be read again> 
                   \mathdollar 
l.51 Sia $\left\{ X_i \,\colon\, i \in I \right\$
                                                  bla, bla, bla \ldots{}
? E
 
Here is how much of TeX's memory you used:
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 9352 words of font info for 37 fonts, out of 8000000 for 9000
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 55i,5n,54p,785b,135s stack positions out of 5000i,500n,10000p,200000b,80000s
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Output written on mwe.pdf (2 pages, 8949 bytes).
PDF statistics:
 18 PDF objects out of 1000 (max. 8388607)
 9 compressed objects within 1 object stream
 0 named destinations out of 1000 (max. 500000)
 1 words of extra memory for PDF output out of 10000 (max. 10000000)