Publications

Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Third Hankel determinant for an inverse of a function associated with the exponential mapping. Filomat

Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Third Hankel determinant for an inverse of a function associated with the exponential mapping. Filomat 39 (2025), no. 22, 7631–7646. MR4976424 

Nagpal, Sumit. Hankel determinant for two subclasses of univalent functions with bounded turning. Lith Math J. 65 (2025), 294-305. MR4912496 

Raj, Ankur; Nagpal, Sumit. Radius Problems for the New Product of Planar Harmonic Mappings. Comput. Methods Funct. Theory. 25 (2025), no. 2, 453–472. MR4908854

Naz, Adiba; Nagpal, Sumit; Ravichandran, V.  Exponential radii of starlikeness and convexity of some special functions. Ramanujan J. 65 (2024), no. 1, 391–427. MR4789402 

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

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

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 

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 

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 

Naz, Adiba; Nagpal, Sumit; Ravichandran, V. Star-likeness associated with the exponential function. Turkish J. Math. 43 (2019), no. 3, 1353--1371. MR3962536 

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 

Kumar, Sushil; Nagpal, Sumit; Ravichandran, V. Coefficient inequalities for Janowski starlikeness. Proc. Jangjeon Math. Soc. 19 (2016), no. 1, 83--100. MR3469654 

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 

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 

Nagpal, Sumit; Ravichandran, V. Fully starlike and fully convex harmonic mappings of order $\alpha$. Ann. Polon. Math. 108 (2013), no. 1, 85--107. MR3021270 

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 

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