Preprints 

• Global Rational Approximations of Functions With Factorially Divergent Asymptotic Series (submitted for publication to the Journal of Approximation Theory) 

N.Castillo, O. Costin, R.d. Costin https://arxiv.org/abs/2210.17502 

• On the Pointwise Existence of Cauchy P.V. Integrals

Nick Castillo, Ovidiu Costin, Kriti Seghal https://arxiv.org/abs/2311.13392 

• Approximations of Functions With Essential Singularities with Applications to Painlevé's First Transcendent

    N. Castillo https://arxiv.org/abs/2403.17170