@Article{JCM-2-33,
author = {Ying-Guang Shi},
title = {Cardinalities of Restricted Ranges},
journal = {Journal of Computational Mathematics},
year = {1984},
volume = {2},
number = {1},
pages = {33--40},
abstract = {<p style="text-align: justify;">Let $l$ and $u$ be upper and lower semicontinuous extended functions on [a,b], respectively, with $l≤u$. Let $H$ be an n-dimensional Haar subspace and $K=\{p\in H:l\leq p\leq u\}$. This paper gives complete characterizations of K satisfying $$card \ K=0 \ or \ 1 \&nbsp; or \ ∞$$ under certain assumptions, where card K denotes the cardinality of K.</p>},
issn = {1991-7139},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/jcm/9637.html}
}