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## Some new inhomogeneous Triebel–Lizorkin spaces on metric measure spaces and their various characterizations

### Tom 167 / 2005

Studia Mathematica 167 (2005), 63-98 MSC: Primary 42B35; Secondary 42B25, 43A99. DOI: 10.4064/sm167-1-5

#### Streszczenie

Let $(X,\varrho,\mu)_{d,\theta}$ be a space of homogeneous type, i.e. $X$ is a set, $\varrho$ is a quasi-metric on $X$ with the property that there are constants $\theta\in (0,1]$ and $C_0>0$ such that for all $x, x', y\in X$, $$|\varrho(x,y)-\varrho(x',y)|\le C_0\varrho(x,x')^\theta[\varrho(x,y) +\varrho(x',y)]^{1-\theta},$$ and $\mu$ is a nonnegative Borel regular measure on $X$ such that for some $d>0$ and all $x\in X$, $$\mu(\{y\in X: \varrho(x,y)< r\})\sim r^d.$$ Let $\varepsilon\in (0,\theta]$, $|s|< \varepsilon$ and $\max\{d/(d+\varepsilon),d/(d+s+\varepsilon)\} < q \le \infty.$ The author introduces new inhomogeneous Triebel–Lizorkin spaces ${F^s_{\infty q}(X)}$ and establishes their frame characterizations by first establishing a Plancherel–Pólya-type inequality related to the norm $\|\cdot\|_{F^s_{\infty q}(X)}$, which completes the theory of function spaces on spaces of homogeneous type. Moreover, the author establishes the connection between the space ${F^s_{\infty q}(X)}$ and the homogeneous Triebel–Lizorkin space ${\dot F^s_{\infty q}(X)}$. In particular, he proves that $\mathop{\rm bmo}\nolimits(X)$ coincides with $F^0_{\infty2}(X)$.

#### Autorzy

• Dachun YangDepartment of Mathematics
Beijing Normal University
Beijing 100875
People's Republic of China
e-mail

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