[hahrÂ´dÄ­-nes] a complex personality attribute that has been identified as a component in the maintenance of health and is the focus of intensive research activities. Generally, there are three elements that contribute to hardiness: control, commitment, and challenge. Control is the belief that an individual can influence events or occurrences, commitment is the deep feeling of involvement in daily activities, and challenge is viewed as an opportunity for development.
In grammar and morphology, triplets are three distinct words derived from the same source at different times and by different routes of transmission. In grammar and morphology, triplets are three distinct words derived from the same source at different times and by different routes of transmission.
Singlet state. In quantum mechanics, a singlet state usually refers to a system in which all electrons are paired. The term singlet originally meant a linked set of particles whose net angular momentum is zero, that is, whose overall spin quantum number s = 0 {\displaystyle s=0}. As a result, there is only one spectral line of a singlet state. In contrast, a doublet state contains one unpaired electron and shows splitting of spectral lines into a doublet; and a triplet state has two unpaired electrons and show