src/HOL/AxClasses/Lattice/LatMorph.ML
author wenzelm
Mon Nov 03 12:24:13 1997 +0100 (1997-11-03)
changeset 4091 771b1f6422a8
parent 1899 0075a8d26a80
child 4153 e534c4c32d54
permissions -rw-r--r--
isatool fixclasimp;
     1 
     2 open LatMorph;
     3 
     4 
     5 (** monotone functions vs. "&&"- / "||"-semi-morphisms **)
     6 
     7 goalw thy [is_mono_def] "is_mono f = (ALL x y. f (x && y) [= f x && f y)";
     8   by (safe_tac (claset()));
     9   (*==> (level 1)*)
    10     by (stac le_inf_eq 1);
    11     br conjI 1;
    12     by (Step_tac 1);
    13     by (Step_tac 1);
    14     be mp 1;
    15     br inf_lb1 1;
    16     by (Step_tac 1);
    17     by (Step_tac 1);
    18     be mp 1;
    19     br inf_lb2 1;
    20   (*==> (level 11)*)
    21     br (conjI RS (le_trans RS mp)) 1;
    22     br inf_lb2 2;
    23     by (subgoal_tac "x && y = x" 1);
    24     be subst 1;
    25     by (Fast_tac 1);
    26     by (stac inf_connect 1);
    27     ba 1;
    28 qed "mono_inf_eq";
    29 
    30 goalw thy [is_mono_def] "is_mono f = (ALL x y. f x || f y [= f (x || y))";
    31   by (safe_tac (claset()));
    32   (*==> (level 1)*)
    33     by (stac ge_sup_eq 1);
    34     br conjI 1;
    35     by (Step_tac 1);
    36     by (Step_tac 1);
    37     be mp 1;
    38     br sup_ub1 1;
    39     by (Step_tac 1);
    40     by (Step_tac 1);
    41     be mp 1;
    42     br sup_ub2 1;
    43   (*==> (level 11)*)
    44     br (conjI RS (le_trans RS mp)) 1;
    45     br sup_ub1 1;
    46     by (subgoal_tac "x || y = y" 1);
    47     be subst 1;
    48     by (Fast_tac 1);
    49     by (stac sup_connect 1);
    50     ba 1;
    51 qed "mono_sup_eq";
    52 
    53