Question:
what is the meaning of polar set?
Answer:
A polar subset of Rn is a set to each point of which corresponds an open neighborhood of
the point that carries a superharmonic function equal to +∞ at each point of the set in
the neighborhood. An inner polar set is a set whose compact subsets are polar.
Let A ⊂ Rn be non-empty. The set
A° ={c ∈ Rn | ⟨c, x⟩ ≤ 1 ∀x ∈ A}
is called the polar of A.
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