First László Székely and more recently Saharon Shelah and Alexander Soifer have presented examples of infinite graphs whose chromatic numbers depend on the axioms chosen for set theory. The existence of such graphs may be relevant to the Chromatic Number of the Plane problem. In this paper we construct a new class of graphs with ambiguous chromatic number. They are unit distance graphs with ver...

In finite population sampling prior information is often available in the form of partial knowledge about an auxiliary variable, for example its mean may be known. In such cases, the ratio estimator and the regression estimator are often used for estimating the population mean of the characteristic of interest. The Polya posterior has been developed as a noninformative Bayesian approach to surv...

T HE effects of exogenous progesterone on the corpus luteum are quite variable. No gross or microscopic effects were apparent in the pregnant rat (Sammelwitz et al., 1956; Aldred et al., 1959) or rabbit (Ulberg, 1952). Selye (1939) reported no effect of progesterone on corpora lutea of late pregnancy in mice, but Burdick (1942) found that treatment begun one or two days post-mating caused lutea...