Null Column Vector vs $ |0 \rangle$

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SUMMARY

There is no difference between a 'null column vector' and the ket notation $ |0 \rangle $ in the context of standard matrix interpretation. Kets represent column vectors, while bras denote their complex conjugate transposes as row vectors. This equivalence holds true in finite-dimensional spaces but may vary in infinite-dimensional Hilbert spaces.

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ognik
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Hi - is there any difference between 'null column vector' and $ |0 \rangle $? Ta
 
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There's no difference in the usual matrix interpretation of bras and kets. Kets are column vectors, and bras are complex conjugate tranposes, so they're row vectors. This does change in infinite-dimensional Hilbert space.
 

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