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I have inserted spaces.
Consider f(x) belonging to f(X)
this means : x belongs to X
But X is a subset of Y
So, x belongs to Y
So, f(x) belongs to f(Y).
Hence all f(x) in f(X) belong to f(Y)
So, f(X) is a subset of f(Y)
Example: f(x) = sin(x) : R -> R
X = [0,2pi]
Y = [-2pi,2pi]
f(X) = [-1,1]
f(Y) = [-1,1]
So, f(X) = f(Y)
Solution
I have inserted spaces.
Consider f(x) belonging to f(X)
this means : x belongs to X
But X is a subset of Y
So, x belongs to Y
So, f(x) belongs to f(Y).
Hence all f(x) in f(X) belong to f(Y)
So, f(X) is a subset of f(Y)
Example: f(x) = sin(x) : R -> R
X = [0,2pi]
Y = [-2pi,2pi]
f(X) = [-1,1]
f(Y) = [-1,1]
So, f(X) = f(Y)

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I have inserted spaces. Consider f(x) belonging to f(X) thi.pdf

  • 1. I have inserted spaces. Consider f(x) belonging to f(X) this means : x belongs to X But X is a subset of Y So, x belongs to Y So, f(x) belongs to f(Y). Hence all f(x) in f(X) belong to f(Y) So, f(X) is a subset of f(Y) Example: f(x) = sin(x) : R -> R X = [0,2pi] Y = [-2pi,2pi] f(X) = [-1,1] f(Y) = [-1,1] So, f(X) = f(Y) Solution I have inserted spaces. Consider f(x) belonging to f(X) this means : x belongs to X But X is a subset of Y So, x belongs to Y So, f(x) belongs to f(Y). Hence all f(x) in f(X) belong to f(Y) So, f(X) is a subset of f(Y)
  • 2. Example: f(x) = sin(x) : R -> R X = [0,2pi] Y = [-2pi,2pi] f(X) = [-1,1] f(Y) = [-1,1] So, f(X) = f(Y)