# What does 'the subspace W = ( < \{> v_1 \})^o' mean?

Can anyone help me understand the notation used at the end of this sentence?

'Now we proceed to the dual space $V'$, and the subspace W = ( < {> v_1 })^o'

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It might be helpful if you provided some more context or maybe a screenshot of what you're reading. –  t.b. Nov 12 '11 at 16:47
I strongly suspect that the formula in question is $W = ( \langle \{ v_1 \} \rangle )^\circ$, and is supposed to be interpreted as the annihilator of the subspace spanned by $v_1$. –  Zhen Lin Nov 12 '11 at 18:05
@ZhenLin: That makes a lot of sense, I believe this to be a typo in my notes. –  Ashbash Nov 13 '11 at 15:24