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What is the largest set for which its set of self bijections is countable?

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#elementary-set-theory #examples-counterexamples #cardinals #infinity
522
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Unique infinite subsets of the integers

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#elementary-set-theory #cardinals #infinity #integers
121
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Is this interpretation of the continuum hypothesis correct?

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#set-theory #cardinals #infinity
560
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Where is the flaw in my Continuum Hypothesis Proof?

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#set-theory #cardinals #infinity
487
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Infinity-to-one function

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#general-topology #continuity #infinity #spheres
42
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If I can prove f(n) = g(n+1) by induction when n is finite, Can I prove f(n) = g(n) by taking n = $\infty$

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#induction #infinity
87
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If we think of infinity as a number, how does it affect the compactness/completeness of a metric space?

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#real-analysis #metric-spaces #compactness #infinity #complete-spaces
862
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Countable-infinity-to-one function

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#general-topology #functions #continuity #infinity
986
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Is arithmetic with infinite numbers fictitious?

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#calculus #logic #soft-question #infinity #nonstandard-analysis
140
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Find the ratio of a geometric sequence such that its sum is $4$ times the first term

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#sequences-and-series #infinity #geometric-progressions
71
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How come it be $\frac{3}{2}A$ and not only $A$?

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#calculus #convergence-divergence #summation #infinity
3.3k
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How can a Cauchy sequence converge to an irrational number?

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#limits #infinity #irrational-numbers #cauchy-sequences #complete-spaces
4.1k
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What's between the finite and the infinite?

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#logic #reference-request #soft-question #infinity
3k
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Does Pi contain itself?

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#infinity #pi
107
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More numbers between $2$ and $4$ than between $2$ and $3$? (I am not a mathematician.)

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#elementary-set-theory #cardinals #infinity

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