📖 Upper and Lower Sums

$U(f,P) = \\sum M_i \\Delta x_i$ and $L(f,P) = \\sum m_i \\Delta x_i$ where $M_i = \\sup f$ and $m_i = \\inf f$ on $[x_{i-1}, x_i]$.

From: Real Analysis

Learn more: https://real-analysis-eta.vercel.app/#/section/13

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