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Are there rules about using “that” to join two clauses?

In mathematical parlance it is customary to write, for example, "One wishes to prove that the following is true." Is the word "that" in the preceding sentence superfluous or necessary and correct?

user02138
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1 Answers1

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The word that in your example is not necessary for clarity. In fact, you could shorten the statement to:

One wishes to prove the following:

The omitted that and ending is true will be assumed by the reader.

jimreed
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