Added a missed (practice) label
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@ -488,7 +488,7 @@ The proof is by induction on both premises.
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and `(ƛ N₂) · M₂ ⇛ N₃ [ M₃ ]`
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and `(ƛ N₂) · M₂ ⇛ N₃ [ M₃ ]`
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by rule `pbeta`
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by rule `pbeta`
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#### Exercise
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#### Exercise (practice)
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Draw pictures that represent the proofs of each of the six cases in
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Draw pictures that represent the proofs of each of the six cases in
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the above proof of `par-diamond`. The pictures should consist of nodes
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the above proof of `par-diamond`. The pictures should consist of nodes
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@ -479,7 +479,7 @@ contexts. While we are at it, we also generalise `twoᶜ` and
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#### Exercise (`mul`) (recommended)
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#### Exercise `mul` (recommended)
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Write out the definition of a lambda term that multiplies
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Write out the definition of a lambda term that multiplies
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two natural numbers, now adapted to the inherently typed
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two natural numbers, now adapted to the inherently typed
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