2 Removed bogus back ticks
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Both are grammatically correct. However, in this case, reading From Theorem XXX we obtain YYY is red color"From Theorem XXX we obtain YYY is red color" can be confusing at first. When first read, your brain might jump to From Theorem XXX we obtain YYY"From Theorem XXX we obtain YYY" by itself. By including that"that", it tells you that an entire clause is coming.

Both are grammatically correct. However, in this case, reading From Theorem XXX we obtain YYY is red color can be confusing at first. When first read, your brain might jump to From Theorem XXX we obtain YYY by itself. By including that, it tells you that an entire clause is coming.

Both are grammatically correct. However, in this case, reading "From Theorem XXX we obtain YYY is red color" can be confusing at first. When first read, your brain might jump to "From Theorem XXX we obtain YYY" by itself. By including "that", it tells you that an entire clause is coming.

1
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Both are grammatically correct. However, in this case, reading From Theorem XXX we obtain YYY is red color can be confusing at first. When first read, your brain might jump to From Theorem XXX we obtain YYY by itself. By including that, it tells you that an entire clause is coming.