How can the President's authority over certain functions be limited according to this article?
The President's authority over certain functions can be limited according to this article by the following provisions:

1. (3)(a) specifies that the President does not hold any functions conferred by existing laws on the government of any State or other authorities, meaning that these functions remain with the respective state governments or other bodies as per the existing laws.
2. (3)(b) states that the Parliament may confer functions upon authorities other than the President through legislation, which again limits the President's authority over certain functions.