The ProofPower environments use \obeyspaces to persuade LaTeX to honour the 
in ML code etc. The ffslides package is doing something that is stopping 
working properly. A quick fix would be to edit the .tex file (lab.tex in your 
example) to replace
spaces between \begin{GFT} and \end{GFT} with tildes.



> On 5 Oct 2016, at 20:55, David Topham <dtop...@ohlone.edu> wrote:
> ...forgot to mention...need to go through postscript, so
> latex lab.tex
> dvipdf lab.dvi
> On Wed, Oct 5, 2016 at 12:28 PM, David Topham <dtop...@ohlone.edu 
> <mailto:dtop...@ohlone.edu>> wrote:
> Thanks Roger, In case you wish to see the problem more exactly attached is 
> the doc file and the ffslides.cls  (which you could also get at CTAN).  It 
> seems that for SML, the spaces are all removed!  I will look into GFT to see 
> how spaces are inserted. One issue might be if verbatim environment is used?  
> -Dave
> On Wed, Oct 5, 2016 at 8:35 AM, Roger Bishop Jones <r...@rbjones.com 
> <mailto:r...@rbjones.com>> wrote:
> David,
> Doctex doesn't chose a font, it just generates LaTeX commands for the formal 
> text and any font changing is up to the rest of the document (that you 
> provide in the =TEX sections of the .doc file).
> It does generate tex for the HOL and ZED paragraphs which is intended to 
> force the layout in the printed version to follow the layout in the source, 
> which tex would not normally do, so I guess the ffslides package is 
> interfering with the way that works.
> The formal text is translated into tex using an environment GFT which is 
> defined in ProofPower.sty, but its beyond my tex expertise to understand how 
> it works or why ffslides is interfering.
> It is possible to get slides made with ProofPower formal text in them, the 
> tutorial slides in the ProofPower distribution are examples of how this can 
> be done, though the method used for them is probably rather ancient by now.
> Roger
> On 04/10/2016 20:14, David Topham wrote:
>> I am exploring a not often used but nice Latex package named ffslides. It 
>> has several advantages in exact control of where things are placed on the 
>> page using postscript (actually pstricks) behind the scenes.  But, one 
>> problem is that the SML in my doc file is getting scrunched together like 
>> this:
>> funsubset([],[])=true
>> Is there a way for me to choose a different font when doctex extracts the 
>> SML? 
>> Maybe I could find an alternative that would not squash?
>> -Dave
>> ,
>> [])=
>> true
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