how <>[]P->P /0   :CD
  <>[]P       /0   :AS
  []P         /0-1 :<>O 2
  P           /0   :[]O(b) 3|]

barcanTheorem = [st|
axiomBTheorem = [st|
Show <>[]P->P /0   :CD
  <>[]P       /0   :AS
  []P         /0-1 :<>O 2
  P           /0   :[]O(b) 3|]
axiomBTheorem = [st|
Show <>[]P->P /0   :CD
  <>[]P       /0   :AS
  []P         /0-1 :<>O 2
  P           /0   :[]O(b) 3|]