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Ted123
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If G=the set of all continuous complex-valued functions on the interval [0,1] and [itex]f,g \in G[/itex] then is [tex]\displaystyle f(x) \int^1_0 g(t) \; dt - g(x) \int^1_0 f(t)\;dt[/tex] in G?
If H=the set of all differentiable complex-valued functions on the interval [0,1] and [itex]f,g \in H[/itex] then is [tex]fg' - gf'[/tex] in H?
If H=the set of all differentiable complex-valued functions on the interval [0,1] and [itex]f,g \in H[/itex] then is [tex]fg' - gf'[/tex] in H?