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                <text>Newspaper notice of A.N. Prior's appointment as a temporary lecturer in philosophy at Canterbury University College.&lt;em&gt; The Press&lt;/em&gt;, 18 December 1945, p. 2.</text>
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                <text>&lt;em&gt;The Press&lt;/em&gt;, 18 December 1945</text>
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                <text>Stanisław Leśniewski (1886–1939) was a Polish logician who is regarded, together with Jan Łukasiewicz, as the founder of the Polish school of logic. He was the originator of an unorthodox system of the foundations of mathematics, based on three formal systems: Protothetic, a logic of propositions and their functions; Ontology: a logic of names and functors of arbitrary order; and Mereology, a general theory of part and whole. He lectured on logic and mathematics at the University of Warsaw from 1919 until his death in 1939, and was the supervisor of Alfred Tarski's doctoral dissertation. Arthur Prior was introduced to his logic system of Protothetic through the work of Bochenski and  Łukasiewicz. Several of the papers that Prior wrote in the early 1950s are based on the analysis of Lesniewski's Protothetic.</text>
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                <text>Alfred Tarski (1901–1983), probably the most famous logician that came out of the Warsaw School of Logic. He was a student of Jan Łukasiewicz at the University of Warsaw. He emigrated to the United States in 1939, at the beginning of the German occupation of Poland. He taught mathematics at UC Berkeley from 1942 until his death in 1983.</text>
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                <text>The most prominent members of the Warsaw School of Logic in 1934. From left: Jan Lukasiewicz, Stanislaw  Lesniewski and Alfred Tarski.</text>
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                <text>Copyright Jacek Jadacki. Used with permission. All rights reserved</text>
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                <text>A photograph of Jan Łukasiewicz (1878 – 1956), the famous founder of the Polish school of logic, who had enormous influence on Arthur Prior's own development as a logician. Łukasiewicz was a professor of philosophy at the University of Warsaw until the end of WWII. This photograph is taken in 1935, when he became a laureate of the Warsaw Scientific Prize. After the war, Łukasiewicz emigrated to Ireland and taught logic at the University College Dublin until his death. He is the inventor of the Polish notation – the logical symbolism that become the signature of Prior's own logical writings.</text>
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                <text>A photograph of Jan Łukasiewicz (1878 – 1956), the famous founder of the Polish school of logic, who had enormous influence on Arthur Prior's own development as a logician. Łukasiewicz was a professor of philosophy at the University of Warsaw until the end of WWII, when he emigrated to Ireland and taught logic at the University College Dublin until his death. He is the inventor of the Polish notation – the logical symbolism that become the signature of Prior's own logical writings. This photograph is taken in 1947. </text>
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                <text>Father Innocenty (Józef) M. Bocheński (1902 – 1995), Polish catholic philosopher and logician, whose books on logic had profound influence on Arthur Prior. After the WWII, Bocheński taught history of the 20th century philosophy at the University of Fribourg (Switzerland) and published several books on logic and history of logic. Prior used Bochenski's &lt;em&gt;A précis de logique mathématique&lt;/em&gt; (1948) and &lt;em&gt;Ancient formal logic&lt;/em&gt; (1951) as textbooks for his logic classes and was inspired by his &lt;em&gt;La logique de Théophraste&lt;/em&gt; (1947) to write his early paper on modal logic, "On propositions neither necessary nor impossible", published in &lt;em&gt;The journal of symbolic logic&lt;/em&gt; in 1953. Bocheński send several letters to Prior in the early 1950s, informing him of the latest developments and forthcoming publications in modal logic.</text>
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                <text>A photograph of Arthur's colleague Carew Arthur Meredith (28 July 1904 – 31 March 1976), taken in Dublin in 1947. Meredith was a mathematician at the Trinity College Dublin and developed strong interest in formal logic under the influence of Jan Łukasiewicz, who taught in Dublin after the WWII. It was Łukasiewicz's suggestion to Meredith in 1952 to write to Prior in New Zealand, that started their productive collaboration and extensive correspondence.</text>
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                <text>46 Perry St. Masterton, New Zealand: the family home and the GP office of Dr. Norman Prior, Arthur's father. Norman himself was born in that house and continued to live there when in 1912 he married his first wife and Arthur's mother Bessie, who died after giving birth to Arthur in 1914. Norman remarried in 1923 with Jessie, who gave birth to Arthur's three half siblings Elaine, Ian and Owen. The house was pulled down in 2013.</text>
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