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b94b763cf1
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b94b763cf1 | |||
672968bdfb |
11
justfile
11
justfile
@ -121,6 +121,17 @@ dist:
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@just build
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@just build-documentation
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# exports notebook to format: html, markdown, pdf, latex.
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export name format="pdf" theme="light":
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@{{PYTHON}} -m jupyter nbconvert \
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--allow-chromium-download \
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--HTMLExporter.theme={{theme}} \
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--TemplateExporter.exclude_input=false \
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--to {{format}} \
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--output-dir notes \
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--ouput "notebook-{{name}}.{{format}}" \
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notebooks/{{name}}.ipynb
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# TARGETS: run
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -101,26 +101,28 @@
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"Für $i\\in\\{0,1,\\ldots,n-1\\}$ ist die $i$-te von $\\mathcal{F}_{n}\\,u_{n,k}$\n",
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"\n",
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"$$\n",
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" \\begin{array}{rcl}\n",
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" (\\mathcal{F}_{n}\\,u_{n,k})_{i}\n",
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" = \\sum_{j=0}^{n-1}\n",
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" (\\mathcal{F}_{n})_{ij}\\,(u_{n,k})_{j}\n",
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" = \\sum_{j=0}^{n-1}\n",
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" &= &\\displaystyle\\sum_{j=0}^{n-1}\n",
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" (\\mathcal{F}_{n})_{ij}\\,(u_{n,k})_{j}\\\\\n",
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" &= &\\displaystyle\\sum_{j=0}^{n-1}\n",
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" \\tfrac{1}{\\sqrt{n}}\n",
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" \\exp(-\\imath\\tfrac{2\\pi\\,ij}{n})\n",
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" \\cdot\n",
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" \\tfrac{1}{\\sqrt{n}}\n",
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" \\exp(\\imath\\tfrac{2\\pi\\,kj}{n})\n",
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" = \\frac{1}{n}\\sum_{j=0}^{n-1}\n",
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" \\exp(\\imath\\tfrac{2\\pi\\,kj}{n})\\\\\n",
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" &= &\\frac{1}{n}\\displaystyle\\sum_{j=0}^{n-1}\n",
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" \\underbrace{\n",
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" \\exp(\\imath\\tfrac{2\\pi\\,(k-i)j}{n})\n",
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" }_{= r^{j}}\n",
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" }_{= r^{j}}\\\\\n",
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" \\end{array}\n",
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"$$\n",
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"\n",
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"wobei $r \\colonequals \\exp(\\imath\\tfrac{2\\pi\\,(k-i)}{n})$.\n",
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"wobei $r := \\exp(\\imath\\tfrac{2\\pi\\,(k-i)}{n})$.\n",
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"Wir haben, dass\n",
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" $r = 1$\n",
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" $\\Leftrightarrow$\n",
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" $\\tfrac{k-i}{n} \\in \\Z$\n",
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" $\\tfrac{k-i}{n} \\in \\mathbb{Z}$\n",
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" $\\Leftrightarrow$\n",
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" $i = k$,\n",
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"da $0\\leq i,k \\leq n-1$.\n",
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@ -130,23 +132,34 @@
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"Aus der o.s. Berechnung erhält man also\n",
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"\n",
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"$$\n",
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" \\begin{array}{rcl}\n",
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" (\\mathcal{F}_{n}\\,u_{n,k})_{i}\n",
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" = \\tfrac{1}{n}\\displaystyle\\sum_{j=0}^{n-1}r^{j}\n",
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" = \\tfrac{1}{n}\n",
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" \\begin{cases}\n",
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" &= &\\tfrac{1}{n}\\displaystyle\\sum_{j=0}^{n-1}r^{j}\\\\\n",
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" &= &\\tfrac{1}{n}\n",
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" \\left\\{\n",
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" \\begin{array}{lcl}\n",
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" \\displaystyle\\sum_{j=0}^{n-1}1 &: &i = k\\\\\n",
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" \\frac{1 - r^{n}}{1 - r} &: &\\text{sonst}\\\\\n",
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" \\end{cases}\n",
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" = \\tfrac{1}{n}\n",
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" \\begin{cases}\n",
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" \\dfrac{1 - r^{n}}{1 - r} &: &\\text{sonst}\\\\\n",
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" \\end{array}\n",
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" \\right.\\\\\n",
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" &= &\\tfrac{1}{n}\n",
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" \\left\\{\n",
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" \\begin{array}{lcl}\n",
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" n &: &i = k\\\\\n",
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" \\frac{1 - 1}{1 - r} &: &\\text{sonst}\\\\\n",
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" \\end{cases}\n",
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" = \\delta_{ik}.\n",
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" \\dfrac{1 - 1}{1 - r} &: &\\text{sonst}\\\\\n",
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" \\end{array}\n",
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" \\right.\\\\\n",
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" &= &\\left\\{\n",
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" \\begin{array}{lcl}\n",
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" 1 &: &i = k\\\\\n",
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" 0 &: &\\text{sonst}\\\\\n",
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" \\end{array}\n",
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" \\right.\\\\\n",
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" &= &\\delta_{ik}.\\\\\n",
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" \\end{array}\n",
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"$$\n",
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"\n",
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"Darum $\n",
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" \\mathcal{F}_{n}\\,u_{n,k}\n",
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"Darum $\\mathcal{F}_{n}\\,u_{n,k}\n",
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" = \\left(\\begin{matrix}\n",
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" 0\\\\\n",
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" 0\\\\\n",
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@ -163,8 +176,7 @@
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" \\\\\n",
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" \\\\\n",
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" \\end{matrix}\n",
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" = \\mathbf{e}_{k}\n",
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"$.\n"
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" = \\mathbf{e}_{k}$.\n"
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]
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},
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{
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