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Zeno's paradox
An ancient puzzle leads ultimately to a remarkable observation on the malleable nature of infinite sums
Jan 7, 2023 • 
Joel David Hamkins
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Zeno's paradox
14
The Book of Numbers
All the numbers, placed in a curious order
Jan 2, 2023 • 
Joel David Hamkins
36

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The Book of Numbers
12
Potential versus actual infinity
Potentialism and actualism offer radically different conceptions of the infinite—the dispute between them will lead us to ultrafinitism and the diverse…
Apr 14, 2023 • 
Joel David Hamkins
23

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Potential versus actual infinity
20
The surreal numbers
All the numbers great and small. The surreal numbers, generated in a recursive process of completion, unify the real numbers, the ordinals, and the…
Jan 6, 2024 • 
Joel David Hamkins
23

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The surreal numbers
5
Structuralism
For mathematical insight, according to the structuralist imperative, investigate mathematical structure and consider mathematical concepts only as…
Apr 4, 2024 • 
Joel David Hamkins
27

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Structuralism
2
Epistemic logic and the problem of common knowledge
With the two generals, Cheryl's birthday, hidden surprises, blue-eyed islanders, pirate treasure division, philosopher's ruling council, coordination…
Apr 27, 2023 • 
Joel David Hamkins
25

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Epistemic logic and the problem of common knowledge
3
Classical propositional logic—introduction
Propositional logic as a clarification of ambiguity, truth tables, propositional worlds, logical entailment, validity, tautologies
May 23, 2023 • 
Joel David Hamkins
21

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Classical propositional logic—introduction
10
Infinite liars
Regrettably, this chapter consists entirely of lies—every sentence in it, including this one, is false.
May 17, 2023 • 
Joel David Hamkins
15

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Infinite liars
3
What is the essential structure of the complex numbers?
I discuss several commonly held perspectives on the complex numbers and explore how their differences engage with several aspects of structuralism in…
Nov 10, 2024 • 
Joel David Hamkins
15

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What is the essential structure of the complex numbers?
The Axiom of Choice
Can we choose an element from each set in a family of nonempty sets? Does every set have a well order? Is the axiom of choice arrogant overreach or does…
Jul 21, 2024 • 
Joel David Hamkins
15

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The Axiom of Choice
2
We can predict the future
Is there a reliable strategy to predict the current and immediate future values of an arbitrary unknown function on the reals?
Aug 28, 2024 • 
Joel David Hamkins
15

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We can predict the future
8
The continuum hypothesis
Is there any infinity strictly between the infinity of the natural numbers ℕ and the infinity of the real numbers ℝ?
Mar 4, 2023 • 
Joel David Hamkins
16

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The continuum hypothesis
10
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