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Date: 13-6-2018
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Date: 26-12-2018
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Date: 23-12-2018
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Consider a second-order ordinary differential equation
If and remain finite at , then is called an ordinary point. If either or diverges as , then is called a singular point. If either or diverges as but and remain finite as , then is called a regular singular point (or nonessential singularity).
REFERENCES:
Arfken, G. "Singular Points." §8.4 in Mathematical Methods for Physicists, 3rd ed. Orlando, FL: Academic Press, pp. 451-453 and 461-463, 1985.
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