But, when you master it, it is possible to pick up the mandatory ancillaries from Rudin or very similar very speedily. FWIW, Rudin will be the standard text for undergrad serious Investigation. Yet another great option is Hoffman's Investigation in Euclidean House. This was the reserve MIT utilised before Rudin https://tarot-bizum65321.isblog.net/a-secret-weapon-for-por-qué-es-bueno-leer-el-tarot-53452241