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Direct analytic proof of positive definiteness of stable characteristic functions

Is there a direct analytic proof that the function $$ f ( t ) = \exp\left(-|t|^\alpha \big[ \lambda + i \theta \operatorname{sign} ( t ) \big]\right), \qquad \lambda > 0, \quad |\theta| < \...
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A distribution defined via an ODE for its Laplace trnsform

Fix a parameter $0 < c < \infty$. As the solution to a certain problem, there is a probability density function $f_c(t)$ on $0 < t < \infty$ with mean $1$ and whose Laplace transform $L(\...
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