Let A and B be any sets with empty intersection, and let left bracketing bar X right bracketing bar denote the cardinal number of a set X. Then left bracketing bar A right bracketing bar + left bracketing bar B right bracketing bar = left bracketing bar A union B right bracketing bar (Ciesielski 1997, p. 68; Dauben 1990, p. 173; Rubin 1967, p. 274; Suppes 1972, pp. 112-113).
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Jonathan is doing really well in all of his classes this semester, 5 A’s & 2 B’s (he has a computer essentials class instead of PLC). In his Algebra class that Nathan is helping him with he has an A+.
Sarah is very positive, enthusiastic and encourages my daughter to do better each time she comes. My daughter’s grade has improved, we are very grateful for Sarah and that she is tutoring our daughter. Way to go ClubZ!
