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Fix emphasis vs definitions in re_with_feedback.md
Changes per #721: - backward shift (operator definition) - lag (operator definition) - forward shift (operator definition) - explosive solution All terms changed from italic to bold as they are definitions per style guide.
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lectures/re_with_feedback.md

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@@ -78,14 +78,14 @@ first-order and second-order linear difference equations.
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## Linear Difference Equations
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We'll use the *backward shift* or *lag* operator $L$.
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We'll use the **backward shift** or **lag** operator $L$.
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The lag operator $L$ maps a sequence $\{x_t\}_{t=0}^\infty$ into the sequence $\{x_{t-1}\}_{t=0}^\infty$
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We'll deploy $L$ by using the equality
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$L x_t \equiv x_{t-1}$ in algebraic expressions.
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Further, the inverse $L^{-1}$ of the lag operator is the *forward shift*
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Further, the inverse $L^{-1}$ of the lag operator is the **forward shift**
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operator.
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We'll often use the equality $L^{-1} x_t \equiv x_{t+1}$ below.
@@ -345,7 +345,7 @@ F = (1-\lambda) G (I - \lambda A)^{-1}
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```
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```{note}
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As mentioned above, an *explosive solution* of difference
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As mentioned above, an **explosive solution** of difference
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equation {eq}`equation_1` can be constructed by adding to the right hand of {eq}`equation_4` a
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sequence $c \lambda^{-t}$ where $c$ is an arbitrary positive
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constant.

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