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visits member for 3 years, 1 month
seen Oct 13 at 18:24

My name is Chris, and I have general interests in some things.


Oct
5
awarded  Notable Question
Oct
3
comment How to prove that the set of all countable ordinals, $\omega_1$, is uncountable / has the cardinality $\aleph_1$?
@AsafKaragila You're right, I just read that cardinals are defined as ordinals after posting my comment... ::foot in mouth:: Still, making the edit would help clear the confusion. However I disagree that it is "overreaching." In my opinion, a question that can be improved should, no matter how old, especially for users who so happen to stumble upon it years later.
Sep
30
revised How to prove that the set of all countable ordinals, $\omega_1$, is uncountable / has the cardinality $\aleph_1$?
changed "least uncountable cardinal" to "least uncountable ordinal" but had to add "number" to meet the 6-character requirement
Sep
30
suggested suggested edit on How to prove that the set of all countable ordinals, $\omega_1$, is uncountable / has the cardinality $\aleph_1$?
Sep
30
comment How to prove that the set of all countable ordinals, $\omega_1$, is uncountable / has the cardinality $\aleph_1$?
@Levon I believe your second sentence should read, "$\omega_1$ is usually defined to be the least uncountable ordinal." Making this edit would clear up some confusion in the comments. As a matter of fact, $\omega_1$ technically isn't a cardinal number. When referring to the least uncountable cardinal, mathematicians typically use $\aleph_1$.
Sep
30
awarded  Explainer
Sep
29
accepted Prove this function is pointwise continuous
Sep
29
revised Are all the points in a nonempty open set limit points?
added Case 2: delta is less than epsilon
Sep
29
revised Are all the points in a nonempty open set limit points?
edited body
Sep
29
suggested suggested edit on Are all the points in a nonempty open set limit points?
Sep
29
answered Are all the points in a nonempty open set limit points?
Sep
24
awarded  Autobiographer
Sep
21
comment Proving of Inequalities
Please add the different methods you've tried. It helps to see what work you've done first, and it makes your question more useful.
Sep
19
revised Prove this function is pointwise continuous
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Sep
19
answered Prove this function is pointwise continuous
Sep
19
revised Prove this function is pointwise continuous
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Sep
19
revised Prove this function is pointwise continuous
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Sep
19
revised Prove this function is pointwise continuous
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Sep
19
revised Prove this function is pointwise continuous
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Sep
19
revised Prove this function is pointwise continuous
deleted 474 characters in body