Tengo estos al comienzo de mi artículo.
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\usepackage{ mathtools, nccmath}
\usepackage{latexsym}
\usepackage[title]{appendix}
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\newtheorem{lemma}{Lemma}[section]
\newtheorem{theorem}[lemma]{Theorem}
\newtheorem{proposition}[lemma]{Proposition}
\newtheorem{corollary}[lemma]{Corollary}
\newtheorem{conjecture}[lemma]{Conjecture}
\newtheorem{construction}[lemma]{Construction}
\newtheorem{example}[lemma]{Example}
\newtheorem{definition}[lemma]{Definition}
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\renewcommand{\hat}{\widehat}
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\renewcommand{\leq}{\leqslant}
\renewcommand{\geq}{\geqslant}
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\newcommand{\Po}{\mathcal{P}}
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\newcommand{\vt}{\mathrm{vert}}
\newcommand{\conv}{\mathrm{conv}}
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cuando hago un pdf tengo una página extra al principio con estas dos líneas
Lemma[section] [lemma]Theorem [lemma]Proposition [lemma]Corollary [lemma]Conjecture [lemma]Example [lemma]Definition
¿A qué se debe eso y cómo puedo solucionarlo?