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36 lines
681 B
Plaintext
36 lines
681 B
Plaintext
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
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<mrow>
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<munderover>
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<mo>∑</mo>
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<mrow>
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<mi>i</mi>
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<mo>=</mo>
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<mn>1</mn>
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</mrow>
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<mi>k</mi>
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</munderover>
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<msup>
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<mfenced>
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<mrow>
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<mfrac>
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<mrow>
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<msub>
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<mi>χ</mi>
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<mi>i</mi>
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</msub>
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</mrow>
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<mrow>
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<msub>
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<mi>σ</mi>
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<mi>i</mi>
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</msub>
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</mrow>
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</mfrac>
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</mrow>
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</mfenced>
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<mn>2</mn>
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</msup>
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</mrow>
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</math>
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