• disjoint
  • sets 𝐴 and 𝐵 are disjoint if their intersection is empty
  • 𝐴∩𝐵 = ∅
• pairwise disjoint (definition #1)
  • synonymous to disjoint
• pairwise disjoint (definition #2)
  • a finite collection of sets 𝐶 = {𝛢₁, 𝛢₂, 𝛢₃, …} are pairwise disjoint if all pairs of sets in 𝐶 are disjoint
  • 𝛢_𝑖 ∩ 𝛢_𝑗 = ∅ for any 𝑖 ≠ 𝑗
• mutually disjoint
  • synonymous to disjoint
• mutually exclusive (definition #1)
  • a finite collection of sets 𝐶 = {𝛢₁, 𝛢₂, 𝛢₃, …} are mutually exclusive if each set in 𝐶 is disjoint to any combination of other sets in 𝐶