17,771 research outputs found
Undocumented Migrants as New (and Peaceful) American Revolutionaries
This essay situates undocumented migrants in the history of the American revolutionary period. The lawbreaking of both groups produced constructive legal and social change. For example, the masses of American revolutionaries and many of their leading men fought to rid the colonies of hereditary aristocracy. Colonists had come to cherish the proto-meritocracy that had bloomed on colonial shores and rankled at local evidence of aristocratic privilege, like the Crown’s grant of landed estates to absentee English aristocrats.
Today’s equivalent hereditary aristocracy is the citizenry of wealthy democracies like the United States. Hereditary citizens use immigration restrictions to reserve the wealth and privilege of rich-world citizenship for themselves and invited guests. The undocumented peacefully challenge this status quo by migrating and remaining in the United States without permission, securing citizenship for their American-born children, and protesting that “no one is illegal.” In these ways the undocumented seize some of the aristocratic privileges of American citizenship and fight for others. For this and other reasons, the undocumented are contemporary heirs to the revolutionary moment—the true tea partiers of the twenty-first century
Triangular curves and cyclotomic Zariski tuples
The purpose of this paper is to exhibit infinite families of conjugate
projective curves in a number field whose complement have the same abelian
fundamental group, but are non-homeomorphic. In particular, for any we
find Zariski tuples parametrized by the -roots of unity up to complex
conjugation. As a consequence, for any divisor of , ,
we find arithmetic Zariski -tuples with coefficients in the
corresponding cyclotomic field. These curves have abelian fundamental group and
they are distinguished using a linking invariant.Comment: 15 pages, 3 figures. To appear in Collectanea Mathematic
Limits to Transits of the Neptune-mass planet orbiting Gl 581
We have monitored the Neptune-mass exoplanet-hosting M-dwarf Gl 581 with the
1m Swope Telescope at Las Campanas Observatory over two predicted transit
epochs. A neutral density filter centered at 550nm was used during the first
epoch, yielding 6.33 hours of continuous light curve coverage with an average
photometric precision of 1.6 mmags and a cadence of 2.85 min. The second epoch
was monitored in B-band over 5.85 hours, with an average photometric precision
of 1.2 mmags and 4.28 min cadence. No transits are apparent on either night,
indicating that the orbital inclination is less than 88.1 deg for all planets
with radius larger than 0.38 R_Nep = 1.48 R_Earth. Because planets of most
reasonable interior composition have radii larger than 1.55 R_Earth we place an
inclination limit for the system of 88.1 deg. The corresponding minimum mass of
Gl 581b remains 0.97 M_Nep = 16.6 M_Earth.Comment: 7 pages, 2 figures, 1 table, to appear in PAS
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