摘 要: | SETS(1 )Aisasetconsistingofa,b,c,dande.(2 )Thesetofallnaturalnumbers (inte gers,rationalnumbers,realnumbers)isusuallycalledanaturalnumerical (integer,rationalnumber,realnumber)set,denotedbyN (Z ,Q ,R ) .(3 )“∈”“ ”Signsthatrepresentthemembershiprelationbetweenasetandaele ment.ForthesetNwhosenumbersareone ,two ,three,etc.FourisamemberofN (4∈N) .FourpointfiveisnotamemberofN(4.5 N) .(4)“ ”Asignthatrepresentstherelationbetweentwosets.A B ,AisasubsetofBorAispartofBorAisincludedinB…
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