Philip Ehrlich

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Name	Philip Ehrlich
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Website	ohio.edu/people/ehrlich
Location	Ohio University
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Hahn’s Embedding Theorem and the oldest open question in set theory

lo.logic set-theory axiom-of-choice ho.history-overview

may 21 at 2:00 Vladimir Kanovei 31●1

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How helpful is non-standard analysis?

Surreal numbers vs. non-standard analysis

Surreal exponentiation — are the varying definitions equivalent? If not, is there agreement on which ones are better?

Was the early calculus inconsistent?

A question regarding a remark of John Horton Conway

Does there exist a surreal long line?

dense orders are saturated

A “mother of all groups”? What kind of structures have “mother of all”s?

Constructing the surreal numbers as iterated Hahn series

Non-ZFC set theory and nonuniqueness of the hyperreals: problem solved?

Continuum Hypothesis

differential geometry using Robinson’s infinitesimals?

Surreals and NSA: some foundational issues

Uniformizing the surcomplex unit circle (2)

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lo.logic× 8
set-theory× 7
nonstandard-analysis× 7
surreal-numbers× 2
reference-request× 2
ra.rings-and-algebras× 2
ho.history-overview× 2
surreal-analysis
model-theory
gr.group-theory

fields
definitions
ct.category-theory
continuum-hypothesis
calculus
ca.analysis-and-odes
big-list
axiom-of-choice
ac.commutative-algebra

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