@mathenaetor
Math, Physics, Philosophy, Guitar, Bach, News, ..., ∃y(x ∈ y ⋀ ∀z ∈ y (∀w(w ⊆ z → w ∈ y) ⋀ ∃w ∈ y ∀v(v ⊆ z → v ∈ w)) ⋀ ∀z(z ⊆ y → (z ≈ y ⋁ z ∈ y)))
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