Example Grade

Jan Burse, created Oct 22. 2018
/**
* Bonner's first hypothetical reasoning example.
*
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:- use_module(library(minimal/hypo)).
/* must take german and can choose between french and italian */
take(S, german),
take(S, french).
take(S, german),
take(S, italian).
/* hans has already taken french */
:- multifile take/2.
take(hans, french).
% ?- use_module(library(minimal/hypo)).
% % 0 consults and 0 unloads in 0 ms.
% Yes
% /* hans would not grade if he takes also italian */
% ?- assumez(take(hans, italian)), grade(hans).
% No
% /* hans would grade if he takes also german */
% ?- assumez(take(hans, german)), grade(hans).
% Yes ;
% No

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