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माना m a n दो धनात्मक पूर्णांक इस प्रकार हैं कि m ≥ 1, n ≥ 1 तथा m पूर्ण n वाँ घात नहीं है अर्थात् कोई ऐसा पूर्णांक p नहीं है जिसके लिए pn = m, सिद्ध कीजिए कि ऐसी कोई परिमेय संख्या a नहीं हैं जिसके लिए an = m.

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pn = m ………………… (1)

an = m ………………… (2)

(1) व (2) की तुलना से,

pn = an

दोनों पक्षों की तुलना से, p= परन्तु यह सम्भव नहीं है ।

∴ ऐसी कोई परिमेय संख्या a नहीं है

जिसके लिए an = m

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