\chapter{ $ ~~ $نظریه‌ی انتگرال~~}\setcounter{section}{2}
برای فضای اندازه‌ی ...
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\section{توابع  اندازه‌پذیر}
روی خط حقیقی
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\section{توابع مقدماتی }
فرآیند تعریف انتگرال ...
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\section{ انتگرال  }
پیشرفت بیشتر منوط به نتیجه‌ی زیر است.