$$\sum_{y\,:\,y=x} P(x,y) = P(x,x)$$
How did the summation get removed? I expected it to simplify into
$$\sum_{y\,:\,y=x} P(x,x)$$
or
$$\sum_{all \, x} P(x,x)$$
2026-03-25 19:00:08.1774465208
Summation Simplication
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