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<p>Hello,</p>
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<p>I have a question regarding the example problem from the document "getting started with DUNE".</p>
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<p>Could you briefly explain the math behind the following lines? Why can you estimate the appropriate quadrature order by these calculations? <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">Also,
why are they slightly different from each other?</span></p>
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<p><span>int order = 2 * (localFiniteElement.localBasis().order()-1); (<span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">P.18,
"</span>For DUNE ver. 2.7", 2020)</span><br>
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<p><span><span>int order = 2∗(dim∗localFiniteElement.localBasis().order()−1); <span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">(P.19
"For DUNE ver. 2.4", 2016</span><span style="font-family: Calibri, Helvetica, sans-serif, Helvetica, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols; font-size: 16px;">)</span></span></span></p>
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<p><span>Best regards,</span></p>
<p><span>Genki Unagami</span></p>
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