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As a sort of follow up question to a previous question found here, besides the Liouville numbers, are there any other uncountable collections of transcendental numbers that are known? Clearly you could union the Liouville numbers with some other transcendental number and get an uncountable collection. I am seeking to find a distinct set from the Liouville numbers.

There are many examples of countable collections of transcendental numbers:

$e^a$ if $a$ is algebraic and nonzero (by the Lindemann–Weierstrass theorem).

$a^b$ where $a$ is algebraic but not 0 or 1, and $b$ is irrational algebraic (by the Gelfond–Schneider theorem)

$\sin(a), \cos(a)$ and $\tan(a),$ for any nonzero algebraic number $a$ (again by the Lindemann–Weierstrass theorem)

But, as all of these are based on the algebraic numbers, none of these collections are uncountable.

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2 Answers 2

up vote 3 down vote accepted

A simple non-Liouville example would be Fredholm numbers, i.e.,

$$\sum_{n=0}^{\infty} \beta^{2^n}$$

for $|\beta|$ in $(0, 1)$.

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Real numbers with irrationality measure larger than 2 are transcedentals and uncountably many - If $a$ is algebraic irrational, then its irrationality measure is 2 - Liouville transcedentals have infinite irrationality measure.

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It seems that one can tweak this a bit and take the set of all reals with irrationality measure greater than $k$ for some number $k$. –  Baby Dragon Jan 10 at 21:52
    
Is there an explicit construction of an uncountable family of such numbers? The nice thing about Liouville numbers is that there's a simple procedure to actually construct an uncountable family. –  Jim Belk Jan 13 at 18:59
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