Boris Hasselblatt, Professor

Tufts University
Medford, MA 02155-5597
Email:

Request a recommendation.

#### Research:

Books I have written or edited:

I am Editor in Chief of:

Journals and book series on whose boards I serve:

Some articles:

• Contact Anosov flows on hyperbolic 3-manifolds
• Longitudinal foliation rigidity and Lipschitz-continuous invariant forms for hyperbolic flows
• Zygmund strong foliations in higher dimension
• Lipschitz-continuous invariant forms for algebraic Anosov systems
• Pointwise hyperbolicity implies uniform hyperbolicity
• The Sharkovsky Theorem: A natural direct proof
• Entropy
• Degree
• Zygmund rigidity
• Hyperbolic dynamics
• Nonuniform hyperbolicity
• Pesin entropy formula
• Select publication information is available if you or your institution have a MathSciNet subscription:
• My publications, reviews, select citations
• A select citation count
• Reviews of some of my publications; a stale version of this is here for those without an MR subscription.
• A small sample of the reviews I have written
• My Erdös number
• My collaboration distance to Avila, Bhargava, Hairer, Mirzakhani (Fields medalists 2014),
Lindenstrauss, Ngó, Smirnov, Villani (Fields medalists 2010).

Tufts Now

#### Quoted

Science Magazine on draft NSF guidance on broader impacts

#### Videos

A 2013 Tokyo lecture on exotic contact Anosov flows and Godbillon-Vey numbers
Summing up my 2013-2014 sabbatical as Chaire Jean Morlet in Marseille
Trying to answer fun questions in Marseille...
Why my 2013-14 year abroad in Marseille?
Why I am away in the summer
The Big Picture
Viewing your future as a PhD student: Talk to the Organization of Graduate Students of Mathematics at Tufts
The Poincaré Institute for Mathematics Education at Tufts University
Tufts University Commencement and Baccalaureate Service 2014
Tufts University Baccalaureate Service 2013
Tufts University Baccalaureate Service 2012
Tufts University Baccalaureate Service 2011
Tufts University Commencement 2013
Tufts University Commencement 2012
Tufts University Commencement 2011
Tufts Presidential Inauguration 2011
Trinity Church in Boston reopens after blasts

#### On location...

I have given talks (or served on a jury) in a Hilbert space, a Banach space, a Baire space, a Schwartz space, a Weyl chamber, and in a Fourier series.

#### Salient values of trigonometric functions

I noticed this pattern in the early 1990s but learned that I am far from being the first to have done so (Jean-Luc Eveno heard this some 20 years earlier from a teacher and surmises that it has been teachers' lore for generations before)—if you have seen this published anywhere I'd be interested in knowing:
 $$x$$ in degrees: $$0^\circ$$ $$30^\circ$$ $$45^\circ$$ $$60^\circ$$ $$90^\circ$$ $$x$$ in radians: $$0$$ $$\displaystyle\frac\pi6$$ $$\displaystyle\frac\pi4$$ $$\displaystyle\frac\pi3$$ $$\displaystyle\frac\pi2$$ "Label": $$0$$ $$1$$ $$2$$ $$3$$ $$4$$ $$\sin(x)$$: $$\displaystyle\frac{\sqrt0}2$$ $$\displaystyle\frac{\sqrt1}2$$ $$\displaystyle\frac{\sqrt2}2$$ $$\displaystyle\frac{\sqrt3}2$$ $$\displaystyle\frac{\sqrt4}2$$

#### Mathematical limericks

A Dozen, a Gross, and a Score,
plus three times the square root of four,
divided by seven,
plus five times eleven,
equals nine squared and not a bit more.
— Jon Saxton

$$\dfrac{12+144+20+3\sqrt4}7+5\cdot11=9^2+0$$

Integral z-squared dz
from 1 to the cube root of 3
times the cosine
of three pi over 9
equals log of the cube root of 'e'.
— Betsy Devine and Joel E. Cohen
in: Absolute Zero Gravity, Simon and Schuster, 1992, p.37.