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What (who) is H square - definition
H square
HARDY SPACE WITH SQUARE NORM
In mathematics and control theory, H2, or H-square is a Hardy space with square norm. It is a subspace of L2 space, and is thus a Hilbert space.
piazza
![Alun-Alun [[Purbalingga]], Central Java](https://commons.wikimedia.org/wiki/Special:FilePath/Alun-alun Purbalingga aerialview25-2-2022.jpg?width=200 "Alun-Alun [[Purbalingga]], Central Java")
![Fountain in [[People's Square]] in [[Shanghai]], China](https://commons.wikimedia.org/wiki/Special:FilePath/Fountain People's Square Shanghai.jpg?width=200 "Fountain in [[People's Square]] in [[Shanghai]], China")
![[[Grand-Place]] in [[Brussels]], Belgium](https://commons.wikimedia.org/wiki/Special:FilePath/Grote Markt (9379072012).jpg?width=200 "[[Grand-Place]] in [[Brussels]], Belgium")
![Announcement of the establishment of the [[State of Slovenes, Croats and Serbs]] on [[Congress Square]] in 1918](https://commons.wikimedia.org/wiki/Special:FilePath/KongressfallofAH.jpg?width=200 "Announcement of the establishment of the [[State of Slovenes, Croats and Serbs]] on [[Congress Square]] in 1918")
![Schlossplatz]] in [[Stuttgart]], Germany](https://commons.wikimedia.org/wiki/Special:FilePath/Neues Schloss Schlossplatzspringbrunnen Jubiläumssäule Schlossplatz Stuttgart 2015 02.jpg?width=200 "Schlossplatz]] in [[Stuttgart]], Germany")
![[[Piazza Navona]] and the Fontana (fountain) del Moro in central [[Rome]], Italy. The fountain in the background is [[Fontana dei Quattro Fiumi]]](https://commons.wikimedia.org/wiki/Special:FilePath/Piazza Navona 1.jpg?width=200 "[[Piazza Navona]] and the Fontana (fountain) del Moro in central [[Rome]], Italy. The fountain in the background is [[Fontana dei Quattro Fiumi]]")
![Plaza Mayor]] of [[Madrid]], [[Spain]]](https://commons.wikimedia.org/wiki/Special:FilePath/Plaza Mayor de Madrid 06.jpg?width=200 "Plaza Mayor]] of [[Madrid]], [[Spain]]")
OPEN PUBLIC SPACES IN CITIES OR TOWNS, USUALLY RECTILINEAR, SURROUNDED BY BUILDINGS, AND OFTEN LOCATED AT THE JUNCTION OF TWO OR MORE THOROUGHFARES
Plaza; Piazza; City square; Public square; Square (city); Praça; Plaza mayor; Town squares; Civic square; Town Square; City Square; Town plaza; Urban square; Public squares; Plazuela; Pedestrian plaza; Pedestrian Plaza; City squares; Plazas; Plaza mayor (urban design)
n.
open square
on a piazza
piazza
OPEN PUBLIC SPACES IN CITIES OR TOWNS, USUALLY RECTILINEAR, SURROUNDED BY BUILDINGS, AND OFTEN LOCATED AT THE JUNCTION OF TWO OR MORE THOROUGHFARES
Plaza; Piazza; City square; Public square; Square (city); Praça; Plaza mayor; Town squares; Civic square; Town Square; City Square; Town plaza; Urban square; Public squares; Plazuela; Pedestrian plaza; Pedestrian Plaza; City squares; Plazas; Plaza mayor (urban design)
[p?'ats?]
¦ noun
1. a public square or marketplace, especially in an Italian town.
2. US archaic the veranda of a house.
Origin
C16: Ital.
