Raamatud Hyon Chol Kim
Harmonic Numbers and Open problems in Series: Harmonic Numbers
Hyon-Chol Kim, Il-Ung Ri, Hae-Ryong Kim
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Discussion and comparison of di¿erent approximate formulas: Approximations for the special functions
Jin-Song Kim, Hyo-Kun Jo, Hyon-Chol Kim
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Open Problems Associated with Special Functions: Gamma functions and Riemann zeta functions
Sin-Il Kim, Song-Bom Mun, Hyon-Chol Kim
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Series and functional series associated with harmonic numbers
Kum-Jin Ri, Hyon-Chol Kim, Chang-Kol Cha
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Application of Sound Waves and Shock Waves: Localization of Static Sound Sources in Air
Hyon Chol Kim, Song Hun Jang, Yun Sok Ri
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Sums and Integrals Associated with Sinc Functions
Ok-Hung Song, Hyon-Chol Kim, Song-Nam Ra
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Mathematical Constants and their Approximations
Hyon Chol Kim, Kyong Mun Choe, Wi Ryong Choe
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