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=2ξf(ξ).jpg "f'(ξ)=2ξf(ξ)")
=δ(ω-ω0).jpg "f(jω)=δ(ω-ω0)")
/r².jpg "f=(g×m₁×m₂)/r²")
.jpg "f=a⊕(a⊕b)")
=f.jpg "f(a∪b)=f")
=-f(ξ)cotξ.jpg "f'(ξ)=-f(ξ)cotξ")
=2πδ(w).jpg "δ(f)=2πδ(w)")
.jpg "f'(ⅹ)")
.jpg "f(+∞)")
