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Show that the signum function f : R rarr...

Show that the signum function `f : R rarr R` given by `f(x)= {(1,if x gt 0), (0, if x = 0), (-1, if x lt 0) :}` is neither one-one nor onto.

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. Each element in .A. has an image in .B. .:. f. is. a function.
Everý element on A have distinct images in B.
.:. f. is one gne.
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V PUBLICATION-RELATIONS AND FUNCTIONS-QUESTION BANK
  1. Prove that the greatest integer function f : R rarrR given by f(x) =[x...

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  2. Show that the modulus function f: R rarr R given by f(x) = |x|, is nei...

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  3. Show that the signum function f : R rarr R given by f(x)= {(1,if x gt ...

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  4. Let A = {1, 2, 3}, B { 4, 5, 6} and let f = {(1,4),(2,5)(3,6)} be a fu...

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  5. In each of the following cases, states whether the function is one-one...

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  6. Let A and B be sets. Show that f: AxxB to BxxA such that f(a,b) = ...

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  7. Let f: N to N be defined by f(n) = { (((n+1)/2)if n is odd), (n/2 if...

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  8. Let A=R-{3} and B=R-{1} Consider the function f:ArarrB defined by f(x)...

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  9. Let f:R rarrR be defined as f(x) = x^4 Choose the correct answer

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  10. Let f:R rarrR be defined as f(x) = 3x Choose the correct answer

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  11. Let f:{2,3,4,5} rarr {3,4,5,9} and g:{3,4,5,9} rarr{7,11 , 15} be func...

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  12. Find g o f and f o g, if f: R rarr R and g: R rarr R are given by f (x...

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  13. Show that if f: A rarr B and g: B rarr C are one-one, then gof : A rar...

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  14. Show that if f: A rarr B and g: B rarr C are onto, then gof : A rarr C...

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  15. Are 'f' and 'g' both necessarily onto, if gof, is onto?

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  16. Let f:{1 , 2,3 ,} rarr {a, b, c} be one-one, and onto function given b...

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  17. Consider f : R rarr R given f(x) = 4x + 3. Show that f is invertible. ...

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  18. Consider of f : N rarrN and h : N rarr R defined as f(x) = 2x, g(y) = ...

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  19. Let S = {1, 2, 3}. Determine whether the function f : S rarr S defined...

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  20. Let f : {1, 3, 4} rarr {1, 2, 5} and g : {1, 2, 5} rarr (1, 3} be gi...

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