निम्नलिखित में से कौन सा फलन एक मान्य स्थितिज फलन (ϕ) है?

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  1. x2 - 3x2y

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संकल्पना:

एक फलन एक मान्य स्थितिज फलन होता है यदि इसके मिश्रित द्वितीय-क्रम आंशिक अवकलज समान हों:

विकल्प की जाँच:

चूँकि मिश्रित आंशिक अवकलज समान हैं, इसलिए फलन एक मान्य स्थितिज फलन है।

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