okey im working with bra-teks now, or dirac notions as its also known.

Im going to start to state some facts ive learned (to see if they are right)

<A| = |A>* (* detonates the complex conjugate)

<A| |B> = <A|B> = <A|B>*

<A|B> = (|A> , |B>)

(<A| C) |B> = <A| (C |B>) = <A|C|B>

where C is somekinda operator. this is how far ive come now. my question is,, exacly what is bra and teks? i understand <A| is bra and |A> is tek but exacly what is it? and what is a operator in the last part?