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[再寄小读者之数学篇](2014-05-28 Ladyzhenskaya 不等式)

fCc(R2)?fL42f1/2L2?1f1/4L2?2f1/4L2,
<script id="MathJax-Element-1" type="math/tex; mode=display">\bex f\in C_c^\infty(\bbR^2)\ra \sen{f}_{L^4}\leq \sqrt{2} \sen{f}_{L^2}^{1/2} \sen{\p_1f}_{L^2}^{1/4} \sen{\p_2f}_{L^2}^{1/4}, \eex</script>
fCc(R3)?fL423/4f1/4L2?1f1/4L2?2f1/4L2?3f1/4L2.
<script id="MathJax-Element-2" type="math/tex; mode=display">\bex f\in C_c^\infty(\bbR^3)\ra \sen{f}_{L^4}\leq 2^{3/4} \sen{f}_{L^2}^{1/4} \sen{\p_1f}_{L^2}^{1/4} \sen{\p_2f}_{L^2}^{1/4} \sen{\p_3f}_{L^2}^{1/4}. \eex</script>