The phase diagram of liquid ³He– ⁴He mixtures in Figure shows that the solubility of ³He in ⁴He remains finite (about 6 pct) as τ → 0. Similarly, the Pb-Sn phase diagram of Figure shows a finite residual solubility of Pb in solid Sn with decreasing τ. What do such finite residual solubilities imply about the form of the function u(x)?

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Stabte Decomposition Unstable (a) 350 327 300 250 232 200 L.4S 190 I83 26.1 71 00 a) 20 80 10 20 30 30 90 100 pure Se Atomis peneni lead (b) Temperature, "C