Faculty Member

Professor Jun Ling

Biography

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Recent research

A New Differential Form And 6-Shere
https://hal.science/hal-05060123v2/document

We construct a new differential form from arbitrary almost complex structures on smooth manifolds. As an application of this differential form we prove that 6-Sphere does not have complex structure. A preprint of these advances was completed on January 29, 2025, and submitted on January 31, 2025. A shorter version of the proof is available online as a preprint:
https://hal.science/hal-05027695v2/document

The question of whether the above 6-dimensional sphere is a complex manifold is generally called the Hopf problem. For discussions on the Hopf problem up to 2017, please refer to:
I. Agricola, G. Bazzoni, and O. Goertsches, On the history of the Hopf problem,, Differential Geometry and its Applications, 57(2018), 1--9.

There is also a series of in-depth discussions on the Hopf problem on MathOverFlow??
Is there a complex structure on the 6-sphere?
https://mathoverflow.net/questions/1973/is-there-a-complex-structure-on-the-6-sphere
Atiyah's May 2018 paper on the 6-sphere
https://mathoverflow.net/questions/304071/atiyahs-may-2018-paper-on-the-6-sphere
......
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Ph.D. in Mathematics
University at Buffalo, The State University of New York (SUNY)

Member, Mathematical Sciences Research Institute (MSRI)
Berkeley, California, Feb 2007 - May 2007

Visiting Fellow, Department of Mathematics
Princeton University, Aug 2022 - Jan 2023

Visiting Professor, Department of Mathematics
Cornell University, Jan 2023 - Jun 2023
https://math.cornell.edu/jun-michael-ling

Teaching
Cornell University
MATH 2130 Calculus III, Spring 2023
https://classes.cornell.edu/browse/roster/SP23/class/MATH/2130

Teaching

MATH 4210

Advanced Calculus I, Fall 2025

MATH 2210

Calculus III, Fall 2025

MATH 2210H

Calculus III, Fall 2025

MATH 1060

Trigonometry, Fall 2025

MATH 1060

Trigonometry, Fall 2025

MATH 2280

Ordinary Differential Equations, Summer 2025

MATH 4220

Advanced Calculus II, Spring 2025

MATH 1210

Calculus I QL, Spring 2025

MATH 1220

Calculus II, Spring 2025

MATH 2270

Linear Algebra, Spring 2025

Presentations

Ling, Jun Michael (Presenter & Author), AGAS, "Some properties of almost complex structures", Department of Mathematics at Cornell University, Cornell University, Ithaca, New York, USA. (March 20, 2023)
Ling, Jun (Presenter & Author), DGGA, "The Square of Nijenhuis Tensor and Its Vanishing Results ", Department of Mathematics at Princeton University, www.math.princeton.edu/events/archive. (October 26, 2022)

Scholarly/Creative Works

Ling, Jun , "A new differential form and 6-Shere" . https://hal.science/hal-05060123v2/document
Ling, Jun , "Integrabily And Cohomology And 6-Sphere" . https://hal.science/hal-05027695v2/document
Ling, Jun Michael , (2021) "The square of Nijenhuis tensor and its vanishing results" (vol. Online Ready). Asian-European Journal of Mathematics,.
Ling, Jun , (2011) "Estimate and monotonicity of the first eigenvalue under Ricci Flow (joint with X. Cao, S. Hou" (vol. 354}, pages 451–463(2012) ). Germany: Math. Ann. /Springer. https://link.springer.com/article/10.1007/s00208-011-0740-6
Ling, Jun , Bian, B. J., Li, S. H., Wang, X. J., (2010) "Trends in Partial Dierential Equations, Advanced Lectures in Mathematics 10" . International Press of Boston,.
Ling, Jun , (2008) "Estimates on the lower bound of the rst gap," (Issue: 3, vol. 16). Comm. Anal. Geometry,.

Awards

Japanese Government Scholarship

The University of Tokyo

Board of Trustees Award of Excellence

UVU