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Run the equivalence chapter's Racket example at render time #150

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Merged
dem-extra1 merged 4 commits into from
Nov 12, 2026
Merged

Run the equivalence chapter's Racket example at render time #150

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b57df91
Run the equivalence chapter's Racket example at render time
claude Nov 11, 2026
97f4391
Merge the engine branch: replay fix and lintr stub (#139)
claude Nov 11, 2026
a49d356
Merge branch 'claude/project-thread-2wtrwq' into claude/project-threa…
dem-extra1 Nov 12, 2026
87a1d64
Introduce the second equivalence check like the first
claude Nov 12, 2026
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17 changes: 13 additions & 4 deletions chapters/_subfiles/equivalence-negation/_racket-equivalence_rem.qmd
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Original file line number Diff line number Diff line change
Expand Up @@ -6,14 +6,23 @@ so a program can check an equivalence.
In Racket, `for*/and` runs its body for every combination of `p` and `q`,
and returns `#f` as soon as the body returns `#f`, and `#t` if it never does:

```racket
```{racket}
#| code-fold: false
(for*/and ([p '(#t #f)]
[q '(#t #f)])
(equal? (or p (and p q)) p))
```

This returns `#t`, as @exr-absorption found.
Replacing the body with `(equal? (not (and p q)) (and (not p) (not q)))`
returns `#f`, as @exr-not-and found.
The result agrees with @exr-absorption.
With a new body, the same loop checks whether the two statements of @exr-not-and are equivalent:

```{racket}
#| code-fold: false
(for*/and ([p '(#t #f)]
[q '(#t #f)])
(equal? (not (and p q)) (and (not p) (not q))))
```

This result agrees with @exr-not-and.

:::
2 changes: 2 additions & 0 deletions chapters/equivalence-negation.qmd
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Expand Up @@ -13,6 +13,8 @@ format:

{{< include ../latex-macros/macros.qmd >}}

{{< include _subfiles/_racket-setup.qmd >}}

::: {.callout-note appearance='simple' collapse=true}
## Source

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