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    • https://phys.libretexts.org/Bookshelves/Thermodynamics_and_Statistical_Mechanics/Book%3A_Thermodynamics_and_Statistical_Mechanics_(Arovas)/01%3A_Fundamentals_of_Probability/1.03%3A_Entropy_and_Probability
      We now extremize S subject to two constraints, and so we define \[S^*\big(\{p\ns_n\},\lambda\ns_0,\lambda\ns_1\big)=-\sum_n p\ns_n \ln p\ns_n - \lambda\ns_0\Big(\sum_n p\ns_n -1 \Big) -\lambda\ns_...We now extremize S subject to two constraints, and so we define S({p\nsn},λ\ns0,λ\ns1)=np\nsnlnp\nsnλ\ns0(np\nsn1)λ\ns1(nX\nsnp\nsnX) . We then have \pzS\pzp\nsn=(lnp\nsn+1+λ\ns0+λ\ns1X\nsn)=0 , which yields the two-parameter distribution p\nsn=e(1+λ\ns0)eλ\ns1X\nsn . To fully determine the distribution \…

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