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Fix emphasis vs definitions in sir_model.md
Changes per #721: - transmission rate - infection rate - recovery rate - effective reproduction number All terms changed from italic to bold as they are definitions per style guide.
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lectures/sir_model.md

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@@ -108,9 +108,9 @@ dynamics are
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In these equations,
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* $\beta(t)$ is called the *transmission rate* (the rate at which individuals bump into others and expose them to the virus).
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* $\sigma$ is called the *infection rate* (the rate at which those who are exposed become infected)
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* $\gamma$ is called the *recovery rate* (the rate at which infected people recover or die).
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* $\beta(t)$ is called the **transmission rate** (the rate at which individuals bump into others and expose them to the virus).
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* $\sigma$ is called the **infection rate** (the rate at which those who are exposed become infected)d)
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* $\gamma$ is called the **recovery rate** (the rate at which infected people recover or die).
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* the dot symbol $\dot y$ represents the time derivative $dy/dt$.
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We do not need to model the fraction $r$ of the population in state $R$ separately because the states form a partition.
@@ -141,7 +141,7 @@ As in Atkeson's note, we set
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The transmission rate is modeled as
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* $\beta(t) := R(t) \gamma$ where $R(t)$ is the *effective reproduction number* at time $t$.
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* $\beta(t) := R(t) \gamma$ where $R(t)$ is the **effective reproduction number** at time $t$.
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(The notation is slightly confusing, since $R(t)$ is different to
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$R$, the symbol that represents the removed state.)

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