Publications
2024
Raj, Ankur; Nagpal, Sumit. Stable close-to-convexity and radius of full convexity for sense-preserving harmonic mappings. Rocky Mountain J. Math. 54 (2024), no. 5, 525–540 . MR4743451
Kaur, Gurpreet; Nagpal, Sumit. Radius problems for ratios of analytic functions involving sigmoid domain. Asian-Eur. J. Math. 17 (2024), no. 1, Paper No. 2350239, 16 pp. MR4706210
Kaur, Gurpreet; Nagpal, Sumit. Radius of convexity of classes associated with the ratio of derivative functions. Rend. Circ. Mat. Palermo (2) 73 (2024), no. 2, 587–601. MR4709079
2023
Kaur, Gurpreet; Nagpal, Sumit. Partial sums and inclusion relations for starlike functions associated with an evolute of a nephroid curve. Bull. Korean Math. Soc. 60 (2023), no. 6, 1477–1496. MR4725852
Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Geometric properties of generalized Bessel function associated with the exponential function. Math. Slovaca 73 (2023), no. 6, 1459–1478. MR4678552
2022
Gandhi, Shweta; Gupta, Prachi; Nagpal, Sumit; Ravichandran, V. Starlike functions associated with an epicycloid. Hacet. J. Math. Stat. 51 (2022), no. 6, 1637--1660. MR4510346
Raj, Ankur; Nagpal, Sumit. Radius of convexity for analytic part of sense-preserving harmonic mappings. Bull. Malays. Math. Sci. Soc. 45 (2022), no. 5, 2665--2679. MR4489583
Kumar, Virendra; Nagpal, Sumit; Cho, Nak Eun. Coefficient functionals for non-Bazilevič functions. Rev. R. Acad. Cienc. Exactas Fís. Nat. Ser. A Mat. RACSAM 116 (2022), no. 1, Paper No. 44, 14 pp. MR4344855
Ravichandran, V.; Nagpal, Sumit. A survey on univalent functions with fixed second coefficient. Math. Newsl. 33 (2022), no. 1, 17--28. MR4518875
2021
Gupta, Prachi; Nagpal, Sumit; Ravichandran, Vaithiyanathan. Inclusion relations and radius problems for a subclass of starlike functions. J. Korean Math. Soc. 58 (2021), no. 5, 1147--1180. MR4303808
Gupta, Prachi; Nagpal, Sumit; Ravichandran, V. Marx-Strohhäcker theorem for multivalent functions. Afr. Mat. 32 (2021), no. 7-8, 1421--1434. MR4327479
Raj, Ankur; Nagpal, Sumit; Ravichandran, V. On the product of planar harmonic mappings. Comput. Methods Funct. Theory 21 (2021), no. 3, 427--452. MR4299907
2020
Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Exponential starlikeness and convexity of confluent hypergeometric, Lommel, and Struve functions. Mediterr. J. Math. 17 (2020), no. 6, Paper No. 204, 22 pp. MR4172977
2019
Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Star-likeness associated with the exponential function. Turkish J. Math. 43 (2019), no. 3, 1353--1371. MR3962536
2017
Ahuja, Om P.; Nagpal, Sumit; Ravichandran, V. A technique of constructing planar harmonic mappings and their properties. Kodai Math. J. 40 (2017), no. 2, 278--288. MR3680562
2016
Kumar, Sushil; Nagpal, Sumit; Ravichandran, V. Coefficient inequalities for Janowski starlikeness. Proc. Jangjeon Math. Soc. 19 (2016), no. 1, 83--100. MR3469654
2015
Nagpal, Sumit; Ravichandran, V. Convolution properties of the harmonic Koebe function and its connection with 2-starlike mappings. Complex Var. Elliptic Equ. 60 (2015), no. 2, 191--210. MR3298078
Mendiratta, Rajni; Nagpal, Sumit; Ravichandran, V. On a subclass of strongly starlike functions associated with exponential function. Bull. Malays. Math. Sci. Soc. 38 (2015), no. 1, 365--386. MR3394060
Mendiratta, Rajni; Nagpal, Sumit; Ravichandran, V. Radii of starlikeness and convexity for analytic functions with fixed second coefficient satisfying certain coefficient inequalities. Kyungpook Math. J. 55 (2015), no. 2, 395--410. MR3367954
Mendiratta, Rajni; Nagpal, Sumit; Ravichandran, V. Second-order differential superordination for analytic functions with fixed initial coefficient. Southeast Asian Bull. Math. 39 (2015), no. 6, 851--864. MR3444396
2014
Nagpal, Sumit; Ravichandran, V. A subclass of close-to-convex harmonic mappings. Complex Var. Elliptic Equ. 59 (2014), no. 2, 204--216. MR3170754
Nagpal, Sumit; Ravichandran, V. Univalence and convexity in one direction of the convolution of harmonic mappings. Complex Var. Elliptic Equ. 59 (2014), no. 9, 1328--1341. MR3210304
Mendiratta, Rajni; Nagpal, Sumit; Ravichandran, V. A subclass of starlike functions associated with left-half of the lemniscate of Bernoulli. Internat. J. Math. 25 (2014), no. 9, 1450090, 17 pp. MR3266533
Nagpal, Sumit; Ravichandran, V. Construction of subclasses of univalent harmonic mappings. J. Korean Math. Soc. 51 (2014), no. 3, 567--592. MR3206405
Ahuja, Om P.; Nagpal, Sumit; Ravichandran, V. Radius constants for functions with the prescribed coefficient bounds. Abstr. Appl. Anal. 2014, Art. ID 454152, 12 pp. MR3261223
Nagpal, Sumit; Ravichandran, V. A comprehensive class of harmonic functions defined by convolution and its connection with integral transforms and hypergeometric functions. Stud. Univ. Babeş-Bolyai Math. 59 (2014), no. 1, 41--55. MR3197914
Nagpal, Sumit; Ravichandran, V. Starlikeness, convexity and close-to-convexity of harmonic mappings. Current topics in pure and computational complex analysis, 201--214, Trends Math., Birkhauser/Springer, New Delhi, 2014. MR3329718
2013
Nagpal, Sumit; Ravichandran, V. Fully starlike and fully convex harmonic mappings of order $\alpha$. Ann. Polon. Math. 108 (2013), no. 1, 85--107. MR3021270
2012
Nagpal, Sumit; Ravichandran, V. Applications of the theory of differential subordination for functions with fixed initial coefficient to univalent functions. Ann. Polon. Math. 105 (2012), no. 3, 225--238. MR2950658
2011
Ali, Rosihan M.; Nagpal, Sumit; Ravichandran, V. Second-order differential subordination for analytic functions with fixed initial coefficient. Bull. Malays. Math. Sci. Soc. (2) 34 (2011), no. 3, 611--629. MR2823592