# Bounded projections in weighted function spaces in a generalized unit disc

Annales Polonici Mathematici (1995)

- Volume: 62, Issue: 3, page 193-218
- ISSN: 0066-2216

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topA. H. Karapetyan. "Bounded projections in weighted function spaces in a generalized unit disc." Annales Polonici Mathematici 62.3 (1995): 193-218. <http://eudml.org/doc/262744>.

@article{A1995,

abstract = {Let $M_\{m,n\}$ be the space of all complex m × n matrices. The generalized unit disc in $M_\{m,n\}$ is >br> $R_\{m,n\} = \{Z ∈ M_\{m,n\}: I^\{(m)\} - ZZ* is positive definite\}$.
Here $I^\{(m)\} ∈ M_\{m,m\}$ is the unit matrix. If 1 ≤ p < ∞ and α > -1, then $L^\{p\}_\{α\}(R_\{m,n\})$ is defined to be the space $L^p\{R_\{m,n\}; [det(I^\{(m)\} - ZZ*)]^α dμ_\{m,n\}(Z)\}$, where $μ_\{m,n\}$ is the Lebesgue measure in $M_\{m,n\}$, and $H^p_α(R_\{m,n\}) ⊂ L^\{p\}_\{α\}(R_\{m,n\})$ is the subspace of holomorphic functions. In [8,9] M. M. Djrbashian and A. H. Karapetyan proved that, if $Reβ > (α+1)/p -1$ (for 1 < p < ∞) and Re β ≥ α (for p = 1), then
$f()= T^\{β\}_\{m,n\}(f)(), ∈ R_\{m,n\},
$where $T^\{β\}_\{m,n\}$ is the integral operator defined by (0.13)-(0.14). In the present paper, given 1 ≤ p < ∞, we find conditions on α and β for $T^\{β\}_\{m,n\}$ to be a bounded projection of $L^p_α(R_\{m,n\})$ onto $H^p_α(R_\{m,n\})$. Some applications of this result are given.},

author = {A. H. Karapetyan},

journal = {Annales Polonici Mathematici},

keywords = {generalized unit disc; holomorphic and pluriharmonic functions; weighted spaces; integral representations; bounded integral operators; weighted function spaces; integral operator; bounded projection},

language = {eng},

number = {3},

pages = {193-218},

title = {Bounded projections in weighted function spaces in a generalized unit disc},

url = {http://eudml.org/doc/262744},

volume = {62},

year = {1995},

}

TY - JOUR

AU - A. H. Karapetyan

TI - Bounded projections in weighted function spaces in a generalized unit disc

JO - Annales Polonici Mathematici

PY - 1995

VL - 62

IS - 3

SP - 193

EP - 218

AB - Let $M_{m,n}$ be the space of all complex m × n matrices. The generalized unit disc in $M_{m,n}$ is >br> $R_{m,n} = {Z ∈ M_{m,n}: I^{(m)} - ZZ* is positive definite}$.
Here $I^{(m)} ∈ M_{m,m}$ is the unit matrix. If 1 ≤ p < ∞ and α > -1, then $L^{p}_{α}(R_{m,n})$ is defined to be the space $L^p{R_{m,n}; [det(I^{(m)} - ZZ*)]^α dμ_{m,n}(Z)}$, where $μ_{m,n}$ is the Lebesgue measure in $M_{m,n}$, and $H^p_α(R_{m,n}) ⊂ L^{p}_{α}(R_{m,n})$ is the subspace of holomorphic functions. In [8,9] M. M. Djrbashian and A. H. Karapetyan proved that, if $Reβ > (α+1)/p -1$ (for 1 < p < ∞) and Re β ≥ α (for p = 1), then
$f()= T^{β}_{m,n}(f)(), ∈ R_{m,n},
$where $T^{β}_{m,n}$ is the integral operator defined by (0.13)-(0.14). In the present paper, given 1 ≤ p < ∞, we find conditions on α and β for $T^{β}_{m,n}$ to be a bounded projection of $L^p_α(R_{m,n})$ onto $H^p_α(R_{m,n})$. Some applications of this result are given.

LA - eng

KW - generalized unit disc; holomorphic and pluriharmonic functions; weighted spaces; integral representations; bounded integral operators; weighted function spaces; integral operator; bounded projection

UR - http://eudml.org/doc/262744

ER -

## References

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