The fight for the Premier League title is getting hotter because Arsenal is getting stronger with the mentality they got last season and this season they have learned a lot, by beating Tottenham at Spurs' home I think Arsenal showed their best qualities, the teamwork shown by Arteta is very happy to compete for the title with Manchester City
Arsenal actually became stronger than the last season and they manage to compete against Manchester City till very last matches of the league. Only three more matches for them to fight and either complete this season with Premier League trophy or with a runner-up position, again like how they ended the last season.
Only what they have been done so far in this season, is enough to prove Arsenal already became much stronger than themselves just one season ago. Will they succeed to beat Manchester City in this race, I don't know and nobody knows. I really hope that Arsenal will succeed because it will make Premier League more exciting and break the domination of Manchester City. With departure of Klopp at Liverpool, Arsenal and Arteta will be biggest competitor against Manchester City in next several seasons. If they can win the league this season, they will be more confident in future and Premier League will be more exciting.