On Sunday, November 10th, 2024 at 08:20, Mikael Sundqvist <mic...@gmail.com>
wrote:
The output for this is perfect, Mikael. Your edit has a few surprises for me.
I'll study it today.
Clearly a slog for anyone to go through. I appreciate it very much. Thank you!
> ------------------------------
> Hi,
>
> On Sun, Nov 10, 2024 at 2:45 AM ntg-contextmailingli.expedited080---
> via ntg-context ntg-context@ntg.nl wrote:
>
> > I'm test driving luametatex. My needs usually extend to expressing formulas
> > in TLA+ using nested display math formulas. Although I have suitable
> > templates for doing this in Mark IV, I can't reproduce these satisfactorily
> > in luametatex. For example, here's a formula from Leslie Lamport's 2006
> > "Lower Bounds for Asynchronous Consensus":
> >
> > ~~~~~~~~~~~ transitive_reduction.tex ~~~~~~~~~~~~~
> >
> > \define\lbr {\lbrace \mkern 0.9mu}
> > \define\rbr {{}\mkern 0.9mu \rbrace}
> > \define\∀ {∀\mkern1mu}
> > \define\∃ {∃\mkern2mu}
> >
> > \startdocument
> >
> > \startplaceformula
> > \startformula [split=yes, align=flushleft, margin=standard,
> > interlinespace=1ex]
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=1, align={left,left}]
> >
> > \NC \text{\it TransitiveClosure}(R) ≜
> > \NR
> >
> > \NC \quad
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=2, align={left,left,left}, location=top]
> >
> > \NC \text{\sc let} \quad
> > \NC \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=1, align={left,left}, location=top]
> >
> > \NC \text{\it Dom} ≜ \lbr r[1]: r ∈ R \rbr
> > \NR
> >
> > \NC \text{\it Rng} ≜ \lbr r[2]: r ∈ R \rbr
> > \NR
> >
> > \NC \text{\it TC}[i ∈ ℕ] ≜
> > \NR
> >
> > \NC \quad
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=1, align={left,left}, location=top]
> >
> > \NC \text{\sc if}\ i = 0\
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=2, align={left,left,left}, location=top]
> >
> > \NC \text{\sc then}\
> > \NC R
> > \NR
> >
> > \NC \text{\sc else}\
> > \NC
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=1, align={left,left}, location=top]
> >
> > \NC \lbr
> > 〈d, e 〉∈ \text{\it Dom} × \text{\it Rng}:
> > \NR
> >
> > \NC \quad \∃ c ∈ \text{\it Dom} ∩ \text{\it Rng}:
> > \bgroup \setupinterlinespace [line=1ex]
> > \startalign [n=1, align={left,left}, location=top]
> >
> > \NC ∧ 〈d, c〉∈ \text{\it TC}[i-1]
> > \NR
> >
> > \NC ∧ 〈c, e〉∈ R \,\rbr
> > \NR
> > \stopalign \egroup
> > \NR
> > \stopalign \egroup
> > \NR
> > \stopalign \egroup
> > \NR
> > \stopalign \egroup
> > \NR
> > \stopalign \egroup
> > \NR
> >
> > \NC \text{\sc in}\
> > \NC \text{\sc union}\ \lbr \text{\it TC}[i] : i ∈ ℕ \rbr
> > \NR
> > \stopalign \egroup
> > \NR
> > \stopalign \egroup \stopformula \stopplaceformula
> >
> > \stopdocument
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > The command
> >
> > $ context --luatex transitive_reduction.tex
> >
> > produces the desired result, but
> >
> > $ context transitive_reduction.tex
> >
> > rejects the alignments and centers the lines instead. Can anyone suggest
> > how I might adapt such nesting of alignments to luametatex?
>
>
> I must admit that I don't know what is the expected output and if I
> did break any of the rules or missed what you want, but the following
> could hopefully work as a start for you:
>
> \define\lbr {\lbrace \mkern 0.9mu}
> \define\rbr {{}\mkern 0.9mu \rbrace}
> \define\∀ {∀\mkern1mu}
> \define\∃ {∃\mkern2mu}
>
> \definemathsimplealign
> [myalign]
> [align=left,
> location=top]
>
> \definemathsimplealign
> [myouteralign]
> [align=left,
> location=center]
>
> \definemathsimplealign
> [mydistancedalign]
> [align=left,
> distance=1em,
> leftmargin=1em]
>
> \definemathsimplealign
> [mymarginedalign]
> [align=left,
> leftmargin=1em]
>
> \startdocument
>
> \startplaceformula
> \startformula [align=flushleft]
> \startmyouteralign
> \NC \mathtextit{TransitiveClosure}(R) ≜
> \NR
>
> \NC
> \startmydistancedalign
> \NC \mtext{\sc let}
> \NC
> \startmyalign
> \NC \mathtextit {Dom} ≜ \lbr r[1]: r ∈ R \rbr
> \NR
> \NC \mathtextit {Rng} ≜ \lbr r[2]: r ∈ R \rbr
> \NR
> \NC \mathtextit {TC\/}[i ∈ ℕ] ≜
> \NR
> \NC
> \startmymarginedalign
> \NC \text{\sc if } i = 0\
> \startmyalign
> \NC \text{\sc then}\
> \NC R
> \NR
>
> \NC \text{\sc else}\
> \NC
> \startmyalign
> \NC \lbr
> 〈d, e 〉 ∈ \text{\it Dom} × \text{\it Rng}:
> \NR
>
> \NC \quad \∃ c ∈ \text{\it Dom} ∩ \text{\it Rng}:
> \startmyalign
>
> \NC ∧ 〈d, c〉 ∈ \mathtextit {TC\/}[i-1]
> \NR
>
> \NC ∧ 〈c, e〉 ∈ R \rbr
> \NR
> \stopmyalign
> \NR
> \stopmyalign
> \NR
> \stopmyalign
> \NR
> \stopmymarginedalign
> \NR
> \stopmyalign
> \NR
> \NC \mtext{\sc in}
> \NC \mtext{\sc union } \lbr \mathtextit {TC\/}[i] : i ∈ ℕ \rbr
> \NR
> \stopmydistancedalign
> \NR
> \stopmyouteralign
> \stopformula \stopplaceformula
>
> \stopdocument
>
> /Mikael
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maillist : ntg-context@ntg.nl /
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