let fi A
B and let A, C A and BicBforiEd and
i =1 a show that preserves inclusions, unions, intersections
/ and differences of setsi-
show th atf preserves inclusions and unions only.
e A.C. A,
2 let fi A B and g:B-3C
If CCC , show that
b If fand g are injective, show that got is injective.
C If got is injective, whatcan Yourayabout injective of fandy ?
@ If f and 9 are surjective, show thatgof is surjective 3
the domain and vonge of f appropriately obtain from fabijectin
function , Draw the graphs of gandgl
(There one several possible choices forg)
C It gof is surjective, what Can You 1sayabout surjectivity of
Dsummarize your answers to (b)-le)intheform ofa theorem
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