Mathematician
## Mike RaughEmail: auranteacus at gmail com Brief Professional Bio |

In reverse-chronologic order:

2017 (June 30)
This talk, given for RIPS17 at IPAM, follows one year after the first
talk for RIPS16:
*Leibniz used Calculus
to solve the Catenary Problem,
but he presented it as a Euclidean Construction
without Explanation*.
In a private letter,
Leibniz explained his analysis. He wrote: ``Let those who don't know
the new analysis try their luck!'' This talk presents his
elegant construction and analysis. Paradoxically, the construction
isn't possible as strictly Euclidean, but it doesn't really matter!
I present the analysis in Leibniz's own idiom of differential
calculus.
A *YouTube video* was prepared by IPAM's expert videographer, Kayleigh Steele.

This was a slight modification of an invited *talk at Dartmouth *
for the
Dartmouth Mathematics Colloquium, April 13.

2017 (January 4)
*The Leibniz Catenary Construction: Geometry vs Analysis in the 17th
Century*, an invited talk for the Special Session on the History
of Mathematics at JMM 17 in Atlanta. This talk positions the
publication of Leibniz's construction at the time when mathematicians
were turning away from Descarte's dictate to present curves as
geometric constructs toward analytic presentations. Leibniz played it
both ways: he published a construction that could only have been
derived using calculus but did not disclose the derivation publicly.

2016 (July 6) An invited talk for RIPS16 at IPAM:
*How did Leibniz Solve the
Catenary Problem? A Mystery Story*.

Turned out not to be a mystery after all!
I learned after this talk that Leibniz explained his
solution in a private letter to Rudolph Von Bodenhausen of 1691.
In ignorance of Bodenhausen, this talk features an independent solution that
demonstrates directly how the hyperbolic functions can be easily discovered at the
heart of the catenary problem.
In the most recent talk at IPAM (June 30), I explained Leibniz's analysis in detail.
(For a discussion of the Bodenhausen letter, see
*supplementary
notes*.)

2013 The Real Numbers are Not Real:,

Also presented to UNM Math & Stats Club on 3/8/2013. See the related Problematic Four Bugs Problem

2012 For New Mexico Math Contest of Feb 4:

(Repeated at Agilent Technologies Inc in Santa Clara at request of Geront Owen, 8/12/2013)

2012 What was on Top of Archimedes' Tomb?, Mar 2 at 27th Los Angeles City College Math Contest (abreviated version of the New Mexico Math Contest talk)

2010 The Innkeeper's Problem and Tale

2009 Irrationality of

2008 How do you know what time it is?

2007 Hey, who really discovered that theorem!

2006

–

I worked with IPAM staff and the late Robert Borrelli of Harvey Mudd College to create the RIPS program in 2001, and then to continue developing the program over the fifteen summers of my directorship. I enjoyed working with the many students and academic mentors who participated in RIPS over all those years.

My approach to
managing the RIPS program,
was presented to the panel *Starting
and maintaining a student industrial research progam in
the mathematical sciences* at the MAA's MathFest of Aug 4, 2007 in San Jose, CA.

RIPS continued in the summer of 2016 under the directorship of the talented Spanish mathematician and teacher Prof. Susana Serna of the Autonomous University of Barcelona. Prof. Serna had been an academic mentor for RIPS teams for the previous eight summers.

2011 Participated in review panel for the NSF and for the S. -T. Yau High School Mathematics Awards.

(Last modified July 13, 2017)