- #1

- 147

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[tex]\bigcup_{t \in T} A_t = \{x : \exists t \in T with x \in A_t \}[/tex]

What means this [tex]\bigcup[/tex] symbol and entire expression?

And question on index set: is it used just for orderring any other set?

- Mathematica
- Thread starter Yegor
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- #1

- 147

- 1

[tex]\bigcup_{t \in T} A_t = \{x : \exists t \in T with x \in A_t \}[/tex]

What means this [tex]\bigcup[/tex] symbol and entire expression?

And question on index set: is it used just for orderring any other set?

- #2

Galileo

Science Advisor

Homework Helper

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[tex]A \cup B = \{x|x\in A \vee x\in B\}[/tex]

To generalize this to a union of an arbitrary number of sets is easy. That's exactly what your expression is: the union of all [itex]A_t[/itex].

- #3

- 147

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thank you very much, Galileo!

What about my guess about "index set"?

What about my guess about "index set"?

- #4

Galileo

Science Advisor

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