Processing math: 100%
Countable union
Set
context
A
∈
S
e
q
u
e
n
c
e
(
X
)
context
n
∈
N
∪
{
∞
}
definiendum
⋃
n
j
=
1
A
j
≡
⋃
A
(
r
a
n
g
e
(
n
)
)
Discussion
Parents
Refinement of
Indexed union
Context
Sequence
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