Maybe not mathematically but Arsenal have guaranteed the lead in the group if we look at it from a logical aspect. Because there is no way PSV are closing the gap of 5 points in only 2 matches. Maybe PSV might revenge this loss in their home match against Arsenal. But Arsenal should be able to defeat Zurich on the final match week and qualify as the leader anyway.
Arsenal has been doing good player management, I remember that in the last game they didn't put gabriel jesus, and some of their good players didn't start playing at the beginning of the game, but even so Arsenal won, Arsenal's coach has and I've been doing a good management of the players to avoid injuries and physical wear and with that he can connect with the premier league and also at the same time be at the top in the europe league. things have probably become closer for the arsenal in another phase because they will have to play against stronger teams, and playing against stronger teams wears out the players. Zurich has nothing left to fight, the arsenal can even play with non-main players to spare the main players and they will still win the game against Zurich
I bet on Arsenal to win this but I was really uncomfortable with the 1-0 score in the last moments. 
I might prefer to bet on both teams to score next time as I guess that PSV would improve their performance against them in a home match. Arsenal would score again but they might not win because it is like they have nearly guaranteed the lead.
I might prefer to bet on both teams to score next time as I guess that PSV would improve their performance against them in a home match. Arsenal would score again but they might not win because it is like they have nearly guaranteed the lead.betting on BTTS in the next game can be risky, I doubt the Arsenal manager will place their best players knowing they are in a good position and also need to have all players in good shape for premier league games. so playing with B players and trying a draw will be the best option for the arsenal
Even though they only won with a narrow result, it seems that Arteta is quite happy and at the same time ensures his troops pass the next round safely.
He also did that in the last game, which proves that Arsenal's main focus is on the premier league and he doesn't want to risk losing players but at the same time they want to win the europe league. that means that in the next game he will put team B to play