{1÷2=x3+4=y5*6=z73=wxy2e-iωtx21nYdydxΔyΔx∂y∂xδyδxπ2-b±b2-4ac2a∫dx∬21dy∭21dθ∑k(nk)∑0≤ i ≤ m0<j<n P(i,j)∏k=1nAk⋃n=1m(Xn∩Yn)f(x)={-x, &x<0x, &x≥0(nk)⟨nk⟩tanθ=sinθcosθAABCx⊕ylimn→∞(1+1n)nmax0≤x≤1xe-x2yields→(1⋯10⋮⋱⋮20⋯30)