# I Bracket VS wavefunction notation in QM

#### olgerm

Gold Member
Since my intention is to understand bracket notation(and its relation to normal notation), I did not formulate my equations by using bracket notation, but I used normal convetional mathematical notations. I used as simple notation as I could and explained meaning of some symbols.

#### weirdoguy

I used as simple notation as I could and explained meaning of some symbols.
And yet it's convoluted and unreadable.

#### olgerm

Gold Member
Main point is that for every possible arguments $a_{arguments\ of\ wavefunction}$ there is one basefunction that is 1 with these arguments and 0 with other arguments.

#### HomogenousCow

The terminology and notation you're using is not standard, nobody really understands what you're saying. Look at a typical QM or linear algebra textbook and use the notation and terminology that they use in there.

• weirdoguy

#### vanhees71

Gold Member
Since my intention is to understand bracket notation(and its relation to normal notation), I did not formulate my equations by using bracket notation, but I used normal convetional mathematical notations. I used as simple notation as I could and explained meaning of some symbols.
Again to put it very clearly: You don't use anything, I've ever seen in the literature. It's unreadable. I don't even know, what you want to write!

You can write QT completely without bras and kets. E.g., Weinberg doesn't use the bra-ket notation at all. However his books are highly readable (and among the best newer textbooks I'm aware of).

• weirdoguy

#### olgerm

Gold Member
Which symbols you do not undersatand? I did not invent any original notation, but used mathematical normal notation. I really do not know how to express these relations using more ordinary notation.
If you really do not understand - can you describe me a example of basevectors. by writing
$\vec{e_{base}} [i ] = ...$, where $\vec{e_{base}}$, is i'th basevector. Maybe I could reformulate my equations to be similar to yours.

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#### weirdoguy

can you describe me a example of basevectors
Base vectors of which space?

#### olgerm

Gold Member
Base vectors of which space?
The ones that can be used here
We have some basis set of functions $\phi_n$ and the components of $\psi$ are the terms $c_n$ in the sum:
$$\psi = \sum_{n}c_{n}\phi_{n}$$