Esther Rantzen Esther Rantzen Dame Esther Louise Rantzen (born 22 June 1940) is an English journalist and television presenter, who presented the BBC television series "That's Life!" for 21 years, from 1973 until 1994. She works with various charitable causes, and founded the charities ChildLine, promoting child protection, which she set up in 1986, and The Silver Line, designed to combat loneliness, which she set up in 2012. Rantzen was born in Berkhamsted, Hertfordshire, England, to Katherine Flora Rantzen ("née" Leverson, 1911–2005) and Henry Barnato Rantzen (1902–1992). She has one younger sister, Priscilla N. Taylor. She attended Buckley Country Day School in
Non-well-founded set theory are equal if and only if they can be pictured by the same apg. Within this framework, it can be shown that the so-called Quine atom, formally defined by Q={Q}, exists and is unique. Each of the axioms given above extends the universe of the previous, so that: V ⊆ A ⊆ S ⊆ F ⊆ B. In the Boffa universe, the distinct Quine atoms form a proper class. It is worth emphasizing that hyperset theory is an extension of classical set theory rather than a replacement: the well-founded sets within a hyperset domain conform to classical set theory. Aczel’s