background: to compare mental health and well- being in different levels of the perceived discrimination among iranian people living in tehran. method: using multi- stage sampling, 1255 subjects with the average age of 45 years and 9 months (including 672 women and 583 men) were selected and they completed all items of the general health questionnaire (ghq), the social well- being inventory (sw...

χ-bounded classes are studied here in the context of star colorings and, more generally, χp-colorings. This fits to a general scheme sparsity and leads natural extensions notion bounded expansion class. In this paper we solve two conjectures related coloring (i.e. χ2) boundedness. One is disproved fact determine which weakening holds true. χp-boundedness stability give structural characterizati...