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Defined the notion of relative boundary (hom_relboundary) and hence
proved the exact homology sequence for a triple of spaces. The proof (following the very explicit one in Hu's "Homology Theory" pp. 32-37) just works from the standard Eilenberg-Steenrod axioms. Also added a few miscellaneous missing "real real" theorems (they existed for R^1 but not R!) and even one list triviality. New definitions and theorems: GROUP_HOMOMORPHISM_HOM_RELBOUNDARY HOMOLOGY_EXACTNESS_TRIPLE_1 HOMOLOGY_EXACTNESS_TRIPLE_2 HOMOLOGY_EXACTNESS_TRIPLE_3 HOM_RELBOUNDARY HOM_RELBOUNDARY_EMPTY MEM_REPLICATE NATURALITY_HOM_INDUCED_RELBOUNDARY REAL_CONTINUOUS_ON_MAX REAL_CONTINUOUS_ON_MIN REAL_INDEFINITE_INTEGRAL_CONTINUOUS hom_relboundary
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