equal
deleted
inserted
replaced
237 have sub0T: "(\<lambda>y. y /\<^sub>R norm y) ` (T - {0}) \<subseteq> sphere 0 1 \<inter> T" |
237 have sub0T: "(\<lambda>y. y /\<^sub>R norm y) ` (T - {0}) \<subseteq> sphere 0 1 \<inter> T" |
238 by (fastforce simp: assms(2) subspace_mul) |
238 by (fastforce simp: assms(2) subspace_mul) |
239 obtain c where homhc: "homotopic_with_canon (\<lambda>z. True) (sphere 0 1 \<inter> S) (sphere 0 1 \<inter> T) h (\<lambda>x. c)" |
239 obtain c where homhc: "homotopic_with_canon (\<lambda>z. True) (sphere 0 1 \<inter> S) (sphere 0 1 \<inter> T) h (\<lambda>x. c)" |
240 apply (rule_tac c="-d" in that) |
240 apply (rule_tac c="-d" in that) |
241 apply (rule homotopic_with_eq) |
241 apply (rule homotopic_with_eq) |
242 apply (rule homotopic_compose_continuous_left [OF hom_hd conT0 sub0T]) |
242 apply (rule homotopic_with_compose_continuous_left [OF hom_hd conT0 sub0T]) |
243 using d apply (auto simp: h_def) |
243 using d apply (auto simp: h_def) |
244 done |
244 done |
245 show ?thesis |
245 show ?thesis |
246 apply (rule_tac x=c in exI) |
246 apply (rule_tac x=c in exI) |
247 apply (rule homotopic_with_trans [OF _ homhc]) |
247 apply (rule homotopic_with_trans [OF _ homhc]) |
248 apply (rule homotopic_with_eq) |
248 apply (rule homotopic_with_eq) |
249 apply (rule homotopic_compose_continuous_left [OF homfg conT0 sub0T]) |
249 apply (rule homotopic_with_compose_continuous_left [OF homfg conT0 sub0T]) |
250 apply (auto simp: h_def) |
250 apply (auto simp: h_def) |
251 done |
251 done |
252 qed |
252 qed |
253 |
253 |
254 |
254 |
4219 by (meson continuous_on_compose [OF contf] conth continuous_on_subset fim) |
4219 by (meson continuous_on_compose [OF contf] conth continuous_on_subset fim) |
4220 show "(h \<circ> f) ` sphere a r \<subseteq> sphere 0 1" |
4220 show "(h \<circ> f) ` sphere a r \<subseteq> sphere 0 1" |
4221 using fim him by force |
4221 using fim him by force |
4222 qed auto |
4222 qed auto |
4223 then have "homotopic_with_canon (\<lambda>f. True) (sphere a r) (sphere b s) (k \<circ> (h \<circ> f)) (k \<circ> (\<lambda>x. c))" |
4223 then have "homotopic_with_canon (\<lambda>f. True) (sphere a r) (sphere b s) (k \<circ> (h \<circ> f)) (k \<circ> (\<lambda>x. c))" |
4224 by (rule homotopic_compose_continuous_left [OF _ contk kim]) |
4224 by (rule homotopic_with_compose_continuous_left [OF _ contk kim]) |
4225 then have "homotopic_with_canon (\<lambda>z. True) (sphere a r) (sphere b s) f (\<lambda>x. k c)" |
4225 then have "homotopic_with_canon (\<lambda>z. True) (sphere a r) (sphere b s) f (\<lambda>x. k c)" |
4226 apply (rule homotopic_with_eq, auto) |
4226 apply (rule homotopic_with_eq, auto) |
4227 by (metis fim hk homeomorphism_def image_subset_iff mem_sphere) |
4227 by (metis fim hk homeomorphism_def image_subset_iff mem_sphere) |
4228 then show ?thesis |
4228 then show ?thesis |
4229 by (metis that) |
4229 by (metis that) |