Connectedness is connected union-closed

Statement

Version using a pivoting set

Suppose $X$ is a topological space. Suppose $A$ is a subset of $X$ and $B_i,i\in I$ is a collection of subsets of $X$. Suppose that:

1. $A$ is a connected space in the subspace topology.
2. For each $i\in I$, $B_i$ is a connected space in the subspace topology.
3. $A\cap B_i$ is non-empty for each $i\in I$>

Then, the space:

$A\cup {\bigcup }_{i\in I}{B}_i$

is a connected space in the subspace topology from $X$.

Version using finite hopping

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