Question 1: Braket notation is a standard notation for describing quantum states in the theory of ________ composed of angle brackets and vertical bars.  

Question 2: The notation was introduced in 1939 by ________,^{[1]} and is also known as Dirac notation.  

Question 3: By the definition of addition and scalar multiplication of linear functionals in the ________,^{[2]}  

Question 4: One of the uses of the outer product is to construct ________.  

Question 5: (The exception to this is if the subsystems are actually ________.  

Question 6: For example, observable physical quantities are represented by selfadjoint operators, such as ________ or momentum, whereas transformative processes are represented by unitary linear operators such as rotation or the progression of time.  

Question 7: In what follows, c_{1} and c_{2} denote arbitrary ________, c* denotes the complex conjugate of c, A and B denote arbitrary linear operators, and these properties are to hold for any choice of bras and kets.  

Question 8: It is usually taken as a postulate or ________ of quantum mechanics, that any operator corresponding to an observable quantity (shortly called observable) is selfadjoint, that is, it satisfies A^{†} = A.  

Question 9: For instance, the ________ operator p has the following form:  

Question 10: This process is very similar to the use of coordinate vectors in ________.  

