Euclides 歐幾里得, Ji he yuan ben 幾何原本, 1966

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21 (一) 		22
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23 		24
24 (二)
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25 (三) 		26
26 (四)
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27 (五) 		28
28 (六)
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29 (七) 		30
30 (八)
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        <div xml:id="echoid-div4" type="body" level="1" n="1">
          <div xml:id="N10950" level="2" n="1" type="chapter">
            <div xml:id="N10954" level="3" n="1" type="chapterhead">
              <div xml:id="N109C0" level="4" n="2" type="definition" type-free="界">
                <pb n="24" file="0024" o="二" o-norm="2" rhead="幾何原本　卷一之首" xlink:href="http://libcoll.mpiwg-berlin.mpg.de/libview?url=/mpiwg/online/permanent/library/02NT95YF/pageimg&mode=imagepath&pn=24"/>
                <figure xml:id="N109EE" number="2">
                  <image file="0024-01"/>
                  <variables xml:id="N109EF" xml:space="preserve">乙甲</variables>
                </figure>
                <p indent="-1" xml:id="N109F1">
                  <s xml:id="N109F3" xml:space="preserve">線、有直、有曲。</s>
                </p>
              </div>
              <div xml:id="N109F6" level="4" n="3" type="definition" type-free="界">
                <head xml:id="N109FC" xml:space="preserve">第三界</head>
                <p indent="-1" xml:id="N109FE">
                  <s xml:id="N10A00" xml:space="preserve">凡線之界、是點。</s>
                  <s xml:id="N10A03" xml:space="preserve">(</s>
                  <s xml:id="N10A05" xml:space="preserve">凡線有界者。</s>
                  <s xml:id="N10A0A" xml:space="preserve">兩界必是點。</s>
                  <s xml:id="echoid-s709" xml:space="preserve">)</s>
                </p>
              </div>
              <div xml:id="N10A0D" level="4" n="4" type="definition" type-free="界">
                <head xml:id="N10A13" xml:space="preserve">第四界</head>
                <p indent="-1" xml:id="N10A15">
                  <s xml:id="N10A17" xml:space="preserve">凡直線止有兩端。</s>
                  <s xml:id="N10A1A" xml:space="preserve">兩端之間。</s>
                  <s xml:id="N10A1D" xml:space="preserve">上下更無一點。</s>
                </p>
                <p xml:id="N10A20">
                  <s xml:id="N10A21" xml:space="preserve">兩點之間。</s>
                  <s xml:id="N10A24" xml:space="preserve">至徑者直線也。</s>
                  <s xml:id="N10A27" xml:space="preserve">稍曲則繞而長矣。</s>
                </p>
                <figure xml:id="N10A2A" number="3">
                  <image file="0024-02"/>
                  <variables xml:id="N10A2B" xml:space="preserve">丙乙甲己戊丁</variables>
                </figure>
                <p indent="-1" xml:id="N10A2D">
                  <s xml:id="N10A2F" xml:space="preserve">直線之中。</s>
                  <s xml:id="N10A32" xml:space="preserve">點能遮兩界。</s>
                  <s xml:id="N10A35" xml:space="preserve">凡量遠近、皆用直線。</s>
                </p>
                <p indent="-1" xml:id="N10A38">
                  <s xml:id="N10A3A" xml:space="preserve">甲乙丙是直線。</s>
                  <s xml:id="N10A3D" xml:space="preserve">甲丁丙、甲戊丙、甲己丙。</s>
                  <s xml:id="N10A40" xml:space="preserve">皆是曲線。</s>
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              <div xml:id="N10A43" level="4" n="5" type="definition" type-free="界">
                <head xml:id="N10A49" xml:space="preserve">第五界</head>
                <p indent="-1" xml:id="N10A4B">
                  <s xml:id="N10A4D" xml:space="preserve">面者。</s>
                  <s xml:id="N10A50" xml:space="preserve">止有長有廣。</s>
                </p>
                <p xml:id="N10A53">
                  <s xml:id="N10A54" xml:space="preserve">一體所見為面。</s>
                </p>
                <p xml:id="N10A57">
                  <s xml:id="N10A58" xml:space="preserve">凡體之影極似於面。</s>
                  <s xml:id="N10A5B" xml:space="preserve">(</s>
                  <s xml:id="N10A5D" xml:space="preserve">無厚之極。</s>
                  <s xml:id="echoid-s728" xml:space="preserve">)</s>
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