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Truth tables suggest that the converse, B→A ≠ A→B.

It is also known that any two vectors

**A**and

**B**are perpendicular if and only if their dot products are zero.

My confusion is...

**A**dot

**B**= 0 →

**A**and

**B**are perpendicular. The converse is also true. Why does this not agree with truth tables?