Mathematics · Mathematical Reasoning
यह सिद्ध करने के लिए कि कथन A ⇒ कथन B है, सुधा 'B नहीं है' मानकर अपना प्रमाण शुरू करती है, और 'A नहीं है' पर पहुँचने के लिए तार्किक तर्क देती है। सुधा ने प्रमाण की किस विधि का उपयोग किया?
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प्रतिधनात्मक द्वारा प्रमाण (Proof by contrapositive)
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