Please help me, I do not understand this sentence in vector mathematics

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Would you explain this sentence in detail?
 

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More context would have been interesting.

While you could use equation 1.100 with complex numbers (the mathematics is fine) it doesn’t make sense in the context that we don’t see - only real values are meaningful.
 
mfb said:
More context would have been interesting.

While you could use equation 1.100 with complex numbers (the mathematics is fine) it doesn’t make sense in the context that we don’t see - only real values are meaningful.
Thank you I understood it