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visits | member for | 5 years, 2 months |
seen | May 10 at 18:00 | |
stats | profile views | 1,651 |
May 5 |
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A question about simple closed curves in finite dimensional Euclidean spaces
Thanks for the clarification |
May 3 |
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A question about simple closed curves in finite dimensional Euclidean spaces
Many thanks for such a complete answer. I am not too familiar with homology theory so it may take me awhile to fully understand your proof. |
May 3 |
accepted | A question about simple closed curves in finite dimensional Euclidean spaces |
May 2 |
asked | A question about simple closed curves in finite dimensional Euclidean spaces |
May 1 |
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A question about Cantor's Power Set theorem without the Axiom of Choice
You are right. I was finally able to digest all the steps of your proof. Proving theorems about all infinite cardinal numbers can be quite tricky when the Axiom of Choice is not available. |
Apr 30 |
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A question about Cantor's Power Set theorem without the Axiom of Choice
In ZF set theory without the Axiom of Choice, there exist infinite sets X which are neither Alephs nor Dedekind-finite. Is it still true for such sets that CARD(2^X) is greater than 2*CARD(X)? |
Apr 29 |
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A question about Cantor's Power Set theorem without the Axiom of Choice
Thanks for the neat proof-in ZF without the Axiom of Choice-that CARD(X(I)) is greater than CARD(X) when X is infinite. |
Apr 29 |
accepted | A question about Cantor's Power Set theorem without the Axiom of Choice |
Apr 28 |
asked | A question about Cantor's Power Set theorem without the Axiom of Choice |
Apr 4 |
awarded | Popular Question |
Mar 6 |
awarded | Yearling |
Mar 3 |
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Questions about a possible way of representing construcive ordinal numbers
I was trying to work out whether any useful notation systems for a segment of the countable ordinal numbers could be developed, using recursive functions-or even just primitive recursive functions-as the notations. When you pointed out the existence of subsets of K which are densely ordered by "<", I saw what was wrong with this idea and why Hardy (who, I believe, first investigated the ordering "<") never went very far with it. |
Mar 2 |
accepted | Questions about a possible way of representing construcive ordinal numbers |
Mar 1 |
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Questions about a possible way of representing construcive ordinal numbers
Please disregard this last comment |
Mar 1 |
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Questions about a possible way of representing construcive ordinal numbers
I seem to have lost most of my question |
Mar 1 |
asked | Questions about a possible way of representing construcive ordinal numbers |
Feb 28 |
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A question about open subsets of Hilbert space whose complements are compact sets
V is a G-delta set (an intersection of a countable sequence of open sets). Since you have shown V to be both connected and locally connected, it follows that V is also arc-wise connected. |
Feb 27 |
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A question about open subsets of Hilbert space whose complements are compact sets
Many thanks for the proof which I was not quite able to find for myself |
Feb 27 |
accepted | A question about open subsets of Hilbert space whose complements are compact sets |
Feb 26 |
asked | A question about open subsets of Hilbert space whose complements are compact sets |