doc-src/Tutorial/Ifexpr/Exercise.ML

+use "normif.ML";
+use "proof.ML";
+qed_spec_mp "normif_correct";
+Addsimps [normif_correct];
+
+use "norm.ML";
+use "proof.ML";
+qed "norm_correct";
+
+Goal "!t e. normal t & normal e --> normal(normif b t e)";
+use "proof.ML";
+qed_spec_mp "normal_normif";
+Addsimps [normal_normif];
+
+use "normal_norm.ML";
+use "proof.ML";
+qed "normal_norm";