After a short while, Mischa Cotlar told Cora that he missed playing the piano very much. Music allowed him to take refuge from the often dismal surrounding reality to enter a world of peace and harmony. Cora immediately invited him to play at her home and, after a long argument, convinced Mischa to accept the offer. Cora's mother delighted in Mischa's playing and always considered it a great personal vindication to have met a talented young man willing to use an instrument she had not succeeded in making important to her own children.

In 1937 Cora Ratto married Manuel Sadosky, her lifelong companion both in mathematics and in political activities. Manuel was a bookish and intense young man from a poor Jewish family whose parents had fled the pogroms in tsarist Russia in 1905. Since the thirties were times of rampant anti-Semitism, Cora chose to use her married name, Cora Ratto de Sadosky, from that time on. ... Cora and Manuel shared a long and happy marriage. Their house was always full of friends, attracted by a hostess who was not only a superb cook, but also a great conversationalist, mixing witticism with wisdom and genuine caring. Cora and Manuel had one daughter [Cora Sadosky] - who also became a mathematician - and one granddaughter, who became the greatest joy of her life. Both of them are called Cora!

In 1945 La junta, with Cora at its helm, had 50,000 volunteers - in a country with fewer than 12 million people - and made a substantial contribution to the Allies' war efforts with money, clothing, and food for the fighting troops. Not only was La junta significant for its solidarity against the Nazis, but it was the first women's mass organisation of its size in Latin American history. In December 1945, as one of two representatives of her organisation, Cora was a founding member of the International Women's Union at its first meeting in Paris.

The Sadoskys returned to Argentina during a period of turmoil and political repression. They were banned from teaching at public universities, as were all those not affiliated with the party in power, and Cora went to work at a commercial enterprise to support the family.

In this work we extend to hyperbolic potential operators (in two-dimensional spaces) some basic continuity properties of elliptic potential operators.

The subject of this work was proposed to me by Professor Mischa Cotlar, who has directed the research and has taught and helped me with a dedication that requires my recognition and admiration. In the particular circumstances in which I began this study, after years away from mathematical work, it is not only Dr Cotlar whom I must thank for his encouragement and help, but also several of the members of the mathematics faculty and, in particular, Dr Alberto González Domínguez who prompted my return to work with his proverbial enthusiasm and generosity. I cannot omit the thanks I owe to Dr Oscar Varsavsky for his friendly and invaluable advice.

From 1958 to 1966 she was an associate professor of mathematics. (She never became a full professor, nor did she achieve due recognition for her research. While she did not complain about having a harder time in her profession for being a woman, she was acutely aware that this was the case.) During her decade at the university, Cora initiated and edited a celebrated series of research publications (the first volume, 'Mathematics and Quantum Physics', was written by Laurent Schwartz, Fields Medal, 1950, the third, 'Singular integrals and Hyperbolic Partial Differential Equations', by the Argentinean-born mathematician Alberto Calderón, National Medal of Science, 1991); this series became an important resource for library interchanges. She also organised a host of advanced courses for several generations of mathematicians, physicists, and chemists, many of whom later became leading scientists in the United States, Latin America, Canada, and Europe. Cora was most remarkable as a teacher. She devoted a part of her immense energy to teaching the first courses in calculus and algebra. She was idolised by her students, who clung to her every word and used to say that they "were willing to go to the barricades for modern algebra!" With her husband, she co-organised an entire teaching system for several hundred students, where thanks to the use of scores of senior and regular teaching assistants and student mentors, they gave a personalised education to each and everyone.

This work takes the reader from what in the U.S. is high-school algebra to the main concepts of (pre-homological) abstract and linear algebra. A course employing this book as text should be able to both initiate the student to the concepts and techniques of algebra and prepare him for graduate-level work. The plan of the book is as follows: an introduction (discussing the various number systems), algebraic structures (relations and operations, propositional algebra, groups, rings, fields, polynomials), and linear algebra (vector spaces, matrices and linear transformations, linear and p-linear forms, determinants, systems of linear equations, inner products, and eigenvalues - all over the reals). There are many examples, carefully presented; while there are relatively few exercises, many of the simple verifications are left to the student. Relationships between different structures are brought out well. For this reader, strong points include a careful treatment of the various "relations and operations", construction of the splitting field of a polynomial, and the presentation of determinants (as p-linear alternating forms (after a discussion of the conventional determinants of orders two and three). ...

We are a group of independent people who, despite having different ideologies and different philosophical positions, believe we can carry out together a task that we all find useful: to provide as many people as possible with as much complementary information as possible, to encourage the formation of their own judgments that each one feels in a position to justify for themselves.

Newspapers generally have nine columns; 'Columna 10' aspires to contain information that is not normally disseminated and that may be useful for a correct understanding of the current reality.