- #1
jdstokes
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Find the cardinality and dimension of the vector space [itex]\mathbb{Z}^{3}_{7}[/itex] over [itex]\mathbb{Z}_{7}[/itex].
[itex]\mathbb{Z}^{3}_{7} = \{ (a,b,c) \; | \; a,b,c \in \mathbb{Z}_{7} \}[/itex].
Then since [itex]\mathbb{Z}_{7}[/itex] is a field [itex]1 \cdot a = a \; \forall \; a[/itex], so [itex]B = \{ (1,0,0), (0,1,0) , (0,0,1) \}[/itex] is a basis of [itex]\mathbb{Z}^{3}_{7}[/itex], so [itex]\dim \mathbb{Z}^{3}_{7} = 3[/itex]. ans = 9, what the?
Thanks
James
[itex]\mathbb{Z}^{3}_{7} = \{ (a,b,c) \; | \; a,b,c \in \mathbb{Z}_{7} \}[/itex].
Then since [itex]\mathbb{Z}_{7}[/itex] is a field [itex]1 \cdot a = a \; \forall \; a[/itex], so [itex]B = \{ (1,0,0), (0,1,0) , (0,0,1) \}[/itex] is a basis of [itex]\mathbb{Z}^{3}_{7}[/itex], so [itex]\dim \mathbb{Z}^{3}_{7} = 3[/itex]. ans = 9, what the?
Thanks
James
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