What have we learned from the Premier League so far?

Brighton's 3-0 win over Arsenal could have a big impact on both teams' seasons [Getty Images]The Premier League takes a near three-week break as we enter a four-game international window.So, what have we learned from the opening five matches of the season? BBC Sport takes a look.Arsenal are beatablePremier League champions Arsenal were looking fairly unstoppable in the opening weeks of the season.A win over Brighton on Saturday would have given the Gunners a club-record equalling eighth consecut