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सिद्ध कीजिए कि f:R rarr R, f(x) ={:...

सिद्ध कीजिए कि `f:R rarr R`,
`f(x) ={:[(1",", "यदि" x gt 0),(0","," यदि" x=0),(-1",", " यदि " x lt 0,):},`
द्वारा प्रदत्त चिह्न फलन न तो एकैकी है और न आच्छादक है ।

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