2. a) The relation is not reflexive
since no person is taller than himself / herself.
The relation is antisymmetric since if person a is taller
than person b, then person b cannot be taller than person a.
The relation is transitive since if person a is taller than
person b and person b is taller than person c, then person a is taller than person
c.
b) The relation is reflexive since every person was born
on the same day as himself / herself.
The relation is not antisymmetric since if person a was born
on the same day as person b, then person b must have also been born on the same day as
person a.
The relation is transitive since if person a was born on the
same day as person b and person b was born on the same day as person c, then person a was
born on the same day as person c.