Context and question: Liber Aboali Abincine de Anima in arte Alchemiae was the most influential, having influenced later medieval chemists and alchemists such as Vincent of Beauvais. However Anawati argues (following Ruska) that the de Anima is a fake by a Spanish author. Similarly the Declaratio is believed not to be actually by Avicenna. The third work (The Book of Minerals) is agreed to be Avicenna's writing, adapted from the Kitab al-Shifa (Book of the Remedy). Ibn Sina classified minerals into stones, fusible substances, sulfurs, and salts, building on the ideas of Aristotle and Jabir. The epistola de Re recta is somewhat less sceptical of alchemy; Anawati argues that it is by Avicenna, but written earlier in his career when he had not yet firmly decided that transmutation was impossible.
What is definitely seen as being written by Avicenna?
Answer: The Book of Minerals
Context and question: The set G is called the underlying set of the group (G, •). Often the group's underlying set G is used as a short name for the group (G, •). Along the same lines, shorthand expressions such as "a subset of the group G" or "an element of group G" are used when what is actually meant is "a subset of the underlying set G of the group (G, •)" or "an element of the underlying set G of the group (G, •)". Usually, it is clear from the context whether a symbol like G refers to a group or to an underlying set.
A subset of the underlying set G of the group (G) cannot be written using what kind of expression?
Answer: unanswerable
Context and question: Despite Martin Luther's harsh polemics against his Roman Catholic opponents over issues concerning Mary and the saints, theologians appear to agree that Luther adhered to the Marian decrees of the ecumenical councils and dogmas of the church. He held fast to the belief that Mary was a perpetual virgin and the Theotokos or Mother of God. Special attention is given to the assertion that Luther, some three-hundred years before the dogmatization of the Immaculate Conception by Pope Pius IX in 1854, was a firm adherent of that view. Others maintain that Luther in later years changed his position on the Immaculate Conception, which, at that time was undefined in the Church, maintaining however the sinlessness of Mary throughout her life. For Luther, early in his life, the Assumption of Mary was an understood fact, although he later stated that the Bible did not say anything about it and stopped celebrating its feast. Important to him was the belief that Mary and the saints do live on after death. "Throughout his career as a priest-professor-reformer, Luther preached, taught, and argued about the veneration of Mary with a verbosity that ranged from childlike piety to sophisticated polemics. His views are intimately linked to his Christocentric theology and its consequences for liturgy and piety." Luther, while revering Mary, came to criticize the "Papists" for blurring the line, between high admiration of the grace of God wherever it is seen in a human being, and religious service given to another creature. He considered the Roman Catholic practice of celebrating saints' days and making intercessory requests addressed especially to Mary and other departed saints to be idolatry. His final thoughts on Marian devotion and veneration are preserved in a sermon preached at Wittenberg only a month before his death:
In which year was the Immaculate Conception dogmatized?
Answer:
1854