What then? (τ ουν?). Since God did not push Israel away (verse Romans 11:1), what is true?

The election (η εκλογη). Abstract for concrete (the elect).

Obtained (επετυχεν). Second aorist active indicative of επιτυγχανω, old verb, to hit upon, only here in Paul. See Romans 9:30-33 for the failure of the Jews.

Were hardened (επωρωθησαν). First aorist passive indicative of πωροω, late verb, to cover with thick skin (πωρος). See on 2. Corinthians 3:14; Mark 3:5.