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ca430017edbaddd2e1bf2fa1109d5395286353fe: $$
(x,t)

4e2080a484a7a111802520ef4532d89f8369c3ec: $$
x+ct

d94e229e0c153bdd05334e6c42f01f9c980f8368: $$
\tau

2e4245713e2c1363e309df705110d79cc788effe: $$
\color{red} s-c\tau=x-ct

e873c3afc8a4575f096335709bdfe1c24562b01b: $$
\mathrm{II}

e0d396edb7417ede9c6abd18b88bfa097cd49ce4: $$
\mathrm{I}_2