File r38/packages/redlog/dcfsfmisc.red artifact 92587815d8 part of check-in f16ac07139

% ----------------------------------------------------------------------
% $Id: dcfsfmisc.red,v 1.2 2004/04/26 16:24:12 dolzmann Exp $
% ----------------------------------------------------------------------
% Copyright (c) 2004 Thomas Sturm
% ----------------------------------------------------------------------
% $Log: dcfsfmisc.red,v $
% Revision 1.2  2004/04/26 16:24:12  dolzmann
% Procedure dcfsf_varlat now returns a list of variables in the sense of logic
% and not a list of kernels containing these variables.
%
% Revision 1.1  2004/03/22 12:31:49  sturm
% Initial check-in.
% Mostly copied from acfsf.
% Includes Diploma Thesis by Kacem plus wrapper for this.
%
% ----------------------------------------------------------------------
lisp <<
   fluid '(dcfsf_misc_rcsid!* dcfsf_misc_copyright!*);
   dcfsf_misc_rcsid!* :=
      "$Id: dcfsfmisc.red,v 1.2 2004/04/26 16:24:12 dolzmann Exp $";
   dcfsf_misc_copyright!* := "Copyright (c) 2004 T. Sturm"
>>;

module dcfsfmisc;
% Differentially closed field standard form miscellaneous. Submodule
% of [dcfsf].

procedure dcfsf_termprint(u);
   % Differentialally closed field term print. [u] is a
   % term. The return value is not specified. Prints [u] AM-like.
   <<
      sqprint !*f2q u where !*nat=nil;
      ioto_prin2 nil
   >>;

procedure dcfsf_clnegrel(r,flg);
   % Differentialally closed field conditionally logically negate
   % relation. [r] is a relation. Returns for [flg] equal to [nil] a
   % relation $R$ such that for terms $t_1$, $t_2$ we have
   % $R(t_1,t_2)$ equivalent to $\lnot [r](t_1,t_2)$. Returns [r] for
   % non-[nil] [flg].
   if flg then r else dcfsf_lnegrel r;

procedure dcfsf_lnegrel(r);
   % Differentialally closed field logically negate relation. [r] is a
   % relation. Returns a relation $R$ such that for terms $t_1$, $t_2$
   % we have $R(t_1,t_2)$ equivalent to $\lnot [r](t_1,t_2)$.
   if r eq 'equal then 'neq
   else if r eq 'neq then 'equal
   else rederr {"dcfsf_lnegrel: unknown operator ",r};

procedure dcfsf_fctrat(atf);
   % Differentialally closed field factorize atomic formula. [atf] is an
   % atomic formula. Returns the factorized left hand side of [atf] as
   % a list $(...,(f_i . n_i),...)$, where the $f_i$ are the factors
   % as SF's and the $n_i$ are the corresponding multiplicities. The
   % integer content is dropped.
   cdr fctrf dcfsf_arg2l atf;

procedure dcfsf_negateat(f);
   % Differentialally closed field negate atomic formula. [f] is an
   % atomic formula. Returns an atomic formula equivalent to $\lnot
   % [f]$.
   dcfsf_mkn(dcfsf_lnegrel dcfsf_op f,dcfsf_argn f);

procedure dcfsf_varlat(atform);
   % Differentialally closed field variable list of atomic formula.
   % [atform] is an atomic formula. Returns the set of variables
   % contained in [atform] as a list.
   dcfsf_varlat1 kernels dcfsf_arg2l(atform);

procedure dcfsf_varlat1(kl);
   foreach k in kl join
      if pairp k and car k eq 'd then
	  {cadr k}
      else
	 {k};

procedure dcfsf_varsubstat(atf,new,old);
   % Differentialally closed substitute variable for variable in atomic
   % formula. [atf] is an atomic formula; [new] and [old] are
   % variables. Returns [atf] with [new] substituted for [old].
   dcfsf_0mk2(dcfsf_op atf,numr subf(dcfsf_arg2l atf,{old . new}));

procedure dcfsf_ordatp(a1,a2);
   % Differentialally closed field order predicate for atomic formulas.
   % [a1] and [a2] are atomic formulas. Returns [T] iff [a1] is
   % strictly less than [a2] wrt. some syntactical ordering; returns
   % [nil] else. The specification that [nil] is returned if
   % $[a1]=[a2]$ is used in [dcfsf_subsumeandcut].
   begin scalar lhs1,lhs2;
      lhs1 := dcfsf_arg2l a1;
      lhs2 := dcfsf_arg2l a2;
      if lhs1 neq lhs2 then return ordp(lhs1,lhs2);
      return dcfsf_ordrelp(dcfsf_op a1,dcfsf_op a2)
   end;

procedure dcfsf_ordrelp(r1,r2);
   % Differentialally closed field standard form relation order
   % predicate. [r1] and [r2] are dcfsf-relations. Returns a [T] iff
   % $[r1] <= [r2]$.
   r1 eq r2 or r1 eq 'equal;

endmodule;  % [dcfsfmisc]

end;  % of file