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I recently wrote the following sentence in my paper, I don't know if the that is is correctly used. In other words, Can that is be used to explain multiple things.

Along the similar classifications as [1-2], we mainly cover the consensus filtering approaches in four groups, that is, consensus on estimate, consensus on measurement, consensus on information and H consensus.

  • Yes, a type error, I will correct it immediately. – wayne Apr 13 '15 at 10:33
  • In addition to that is, you might want to consider i.e. and a color (:) as alternatives. – Damkerng T. Apr 13 '15 at 11:04
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Yes, "that is" can introduce an explanation that consists of a list of multiple things. That's not a grammatical problem, because it doesn't mean the same thing as "those are". Instead, it is a shorter way to say "that is to say", which means the same thing as "in other words". It simply means "here's an explanation", which is why it uses the singular.

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