Determinant of a 5×5 Matrix

 

How boring was the last Linear Algebra lecture? (It was an applications lecture.)

Boring enough for me to do this in my notebook.

5x5det

Have fun pronouncing all the terms.

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2013 USAMO Qualifier Statistics

usamostates2013

Here is one splitting of the USA into four portions with approximately the same number of USAMO qualifiers in each.

Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey (65)
Pennsylvania, Delaware, Maryland, District of Columbia, West Virginia, Virginia, North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Tennessee, Kentucky, Ohio, Michigan, Indiana (62)
Illinois, Wisconsin, Minnesota, Iowa, Missouri, Arkansas, Louisiana, Texas, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Montana, Wyoming, Colorado, New Mexico, Arizona, Utah, Nevada, Idaho, Oregon, Washington, Alaska, Hawaii (60)
California (72)

Last names with multiple representatives:

usamolastnames2013

ERRATUM: Xia actually had 1. Thanks to totalepicfailure for the correction.