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\mathchardef\d="0064
$$ x∧(y∨z) ≥ (x∧y)∨(x∧z) $$
$$ f(ξ,η) = ∑_{i=1}^m ∑_{j=1}^n f(x_iα_{ij}y_j,α_{ij}) = f(β_i,γ_j) $$
$$ (φ,ψ) = ∫φ(x)\,ψ(x)\,\d x $$
$$ 240° + 240° → 120° $$
$$ A△B = (A∖B)∪(B∖A) $$
$$ τ(E∪F) = τ\!\left(⋃_{n=1}^∞ τ(E_n)\right) = ∑_{n=1}^∞ τ(E_n) $$
$$ ∀f_n∈F\colon ∫f_n\,\dμ↘0 $$
$$ A≈B ⇔ B≈A $$
$$ Ξ = X^i{∂\over∂x^i} + Y^A{∂\over∂y^A} + Z^A_i{∂\over∂y^A_i} $$
$$ \hatΛ_c \hatΛ_{c'} ≠ 0 $$
$$ W_{j→k}(τ_0,τ) = {2π\overℏ}|H^{\rm I}_{kj}|^2\,δ_{Δτ}(ω_{kj})\,Δτ $$
$$ Β(β)/Γ(γ) ≪ Ζ(ζ)/Υ(υ) $$
$$ 1\;℉ = 5/9\;℃\;,\quad 1\;Å = 10^{-4}\;µ{\rm m} $$
\bye