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15
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Is there a standard ordering of non-ordinal order types?

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#order-theory #ordinals #well-orders
296
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Is it true that in a partial order the intersection of two upper cones is either disjoint or again an upper cone?

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#order-theory
178
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Finite connected poset is contractible

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#algebraic-topology #order-theory #simplicial-stuff
285
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What is the cardinality of the set of equivalence classes of countable order types under bi-embeddability?

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#set-theory #order-theory #cardinals #ordinals
549
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the generalized Delta System Lemma

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#set-theory #proof-explanation #order-theory #infinitary-combinatorics
146
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Combining orderings by agreement

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#combinatorics #order-theory
51
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Maps $f:X\to X$ with $x \geq f(x$)

Published on
#reference-request #order-theory #homotopy-theory
239
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Back-n-Forth or a Direct Isomorphism Between A Countable DLO Without Endpoints and $U = \{ \frac{m}{2^n} \}$

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#elementary-set-theory #order-theory #model-theory #recursive-algorithms
47
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Suppose that $(A,<)$ is a toset and that $A_1$ is dense in $A$. What are the conditions for which $A_2=A\setminus A_1$ is dense in $A$?

Published on
#order-theory
86
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The supremum axiom for real numbers.

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#calculus #order-theory #real-numbers
77
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Asymptotic Problem Complexity = Infimum of Asymptotic Algorithm Complexities?

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#algorithms #computer-science #order-theory #computational-complexity #computability
1.3k
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The unique isomorphism between well-ordered sets

Published on
#proof-verification #order-theory
116
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A Lemma in Transfinite Recursion Theorem

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#proof-verification #order-theory #ordinals
917
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It there an order-preserving mapping?

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#elementary-set-theory #order-theory
169
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When is every principal filter an intersection of ultrafilters?

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#abstract-algebra #order-theory #lattice-orders #filters

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