For any physical property in quantum mechanics , there is a list of all the states where that property has some value. These states are necessarily perpendicular to each other using the Euclidean notion of perpendicularity which comes from sums-of-squares length, except that they also must not be i multiples of each other. This list of perpendicular states has an associated value which is the value of the physical property. The superposition principle guarantees that any state can be written as a combination of states of this form with complex coefficients. [ clarification needed ]
At the same time, they are not necessarily postponing when they have kids. As the sociologists Kathryn Edin and Maria Kefalas have found in interviews with low-income mothers , many see having children as an essential part of life, and one that they aren’t willing to put off until they’re older, when the probability of complications in pregnancy can increase. For mothers-to-be from more financially stable backgrounds, the calculation is different: They often wait longer to have children, since their career prospects and earnings are likely to improve during the period when they might otherwise have been raising a child. For less-educated women, such an improvement is much rarer .
Before one get into the theories of leadership, it is good to understand that there is a leadership timeline that include three different phases ( (Isaac Mostovicz, Kakabadse, & Kakabadse, 2009, p. 556). These phases explain the "metamorphoses" or process a leader needs to undergo in order to become a leader of the future. This process is "â€¦in line with Koselleck (1985, 2002), and it defines and captures human development fuelled by the vision of possibilities" (Isaac Mostovicz, Kakabadse, & Kakabadse, 2009)