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@@ -7838,7 +7838,7 @@ <h2 id="Idea">Idea<a class="anchor-link" href="#Idea">ΒΆ</a></h2><p>Consider the
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@@ -7854,24 +7854,25 @@ <h2 id="Curvature">Curvature<a class="anchor-link" href="#Curvature">ΒΆ</a></h2>
78547854< p > $$e^{\tau \partial_a}e^{\epsilon \partial_{b}} \stackrel{?}{=}
78557855e^{\tau \partial_a+\epsilon \partial_{b}} $$</ p >
78567856< p > This is true when $\tau$ and $\epsilon$ are small, but small compared to what? Compared to the curvature. This is what we are assuming by a < em > linear</ em > vector manifold. One way to measure curvature, would be to move along $a$ then $b$, then back along $-a$ < em > then</ em > $-b$. Basically reverse your steps in a different order to get back to the start.< br >
7857- $$\Delta f
7858- = e^{-\tau \partial_a}e^{-\epsilon \partial_b}e^{\tau \partial_a}e^{\epsilon \partial_b}f -f
7859- =( e^{-\tau \partial_a}e^{-\epsilon \partial_b}e^{\tau \partial_a}e^{\epsilon \partial_b}-1)f
7860- = (R\tilde{R} -1)f $$
7861- Another method is to compare the difference in $f$ at some nearby point, going either way .</ br > </ p >
7862- < p > $$\Delta f
7863- = e^{\tau \partial_a}e^{\epsilon \partial_b}f -e^{\epsilon \partial_b}e^{\tau \partial_a}f
7864- = (R -\tilde R )f
7865- $$
7866- Lets see if we can re-work this in terms of conjugation, because conjugation is dank.
7857+ \begin{align*}
7858+ \Delta f &= e^{-\tau \partial_a}e^{-\epsilon \partial_b}e^{\tau \partial_a}e^{\epsilon \partial_b}f -f\\
7859+ &=( e^{-\tau \partial_a}e^{-\epsilon \partial_b}e^{\tau \partial_a}e^{\epsilon \partial_b}-1)f\\
7860+ &= (R\tilde{R} -1)f \\
7861+ \end{align*}</ br > </ p >
7862+ < p > Another method is to compare the difference in $f$ at some nearby point, going either way .</ p >
7863+ < p > \begin{align*}
7864+ \Delta f &= e^{\tau \partial_a}e^{\epsilon \partial_b}f -e^{\epsilon \partial_b}e^{\tau \partial_a}f \\
7865+ &= (R -\tilde R )f
7866+ \end{align*}</ p >
7867+ < p > Lets see if we can re-work this in terms of conjugation, because conjugation is dank.
78677868$$ e^{\tau \partial_a}e^{\epsilon \partial_b} fe^{\tilde{\epsilon \partial_b}}e^{\tilde{\tau \partial_a}}
78687869 =f(x+\tau a +\epsilon b -\epsilon b -\tau a ) =f(x) $$
78697870which is a dumb thing to write when we are in a linear space.</ p >
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@@ -7921,7 +7922,7 @@ <h3 id="Exponetial-of-a--Differential">Exponetial of a Differential<a class="an
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@@ -7936,7 +7937,7 @@ <h3 id="Exponetial-of-a--Differential">Exponetial of a Differential<a class="an
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@@ -7947,7 +7948,7 @@ <h2 id="Ortho-not-Normal">Ortho-not-Normal<a class="anchor-link" href="#Ortho-no
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@@ -7957,7 +7958,7 @@ <h2 id="Curvature--on-a-sphere">Curvature on a sphere<a class="anchor-link" hre
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@@ -7994,7 +7995,7 @@ <h2 id="Curvature--on-a-sphere">Curvature on a sphere<a class="anchor-link" hre
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@@ -8010,7 +8011,7 @@ <h2 id="Transmission-line-Model">Transmission line Model<a class="anchor-link" h
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@@ -8025,7 +8026,7 @@ <h2 id="Others">Others<a class="anchor-link" href="#Others">ΒΆ</a></h2><p>How ca
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