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Using elementary arguments based on the Fourier transform we prove that for$1 \leq q < p < \infty$ and $s \geq 0$ with $s > n(1/2-1/p)$, if $f \inL^{q,\infty}(\R^n) \cap \dot{H}^s(\R^n)$ then $f \in L^p(\R^n)$ and thereexists a constant $c_{p,q,s}$ such that  \[ \|f\|_{L^p} \leq c_{p,q,s} \|f\|_{L^{q,\infty}}^\theta \|f\|_{\dotH^s}^{1-\theta}, \] where $1/p = \theta/q + (1-\theta)(1/2-s/n)$. Inparticular, in $\R^2$ we obtain the generalised Ladyzhenskaya inequality$\|f\|_{L^4}\le c\|f\|_{L^{2,\infty}}^{1/2}\|f\|_{\dot H^1}^{1/2}$. We alsoshow that for $s=n/2$ the norm in $\|f\|_{\dot H^{n/2}}$ can be replaced by thenorm in BMO. As well as giving relatively simple proofs of these inequalities,this paper provides a brief primer of some basic concepts in harmonic analysis,including weak spaces, the Fourier transform, the Lebesgue DifferentiationTheorem, and Calderon-Zygmund decompositions.

Generalised Gagliardo-Nirenberg inequalities using weak Lebesgue spaces and BMO