**[1]** Previously, we introduced the notion of an intensity matrix when $ S $\n",
"is finite and the definition is essentially unchanged in the current\n",
"setting. In particular, $ Q \\colon S \\times S \\to \\RR $ is called an\n",
"**intensity matrix** if $ Q $ has zero row sums and $ Q(x, y) \\geq 0 $ whenever\n",
"$ x \\not= y $."
]
}
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"title": "UC Markov Semigroups"
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