1. Cover for Vol. 5, No.1

Pages 0-0

• Editorial
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2. A History of Selected Topics in Categorical Algebra I: From Galois Theory to Abstract Commutators and Internal Groupoids

Pages 1-54

George Janelidze

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3. On Condition (G-PWP)

Pages 55-84

Mostafa Arabtash; Akbar Golchin; Hossein Mohammadzadeh Saany

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4. The ring of real-valued functions on a frame

Pages 85-102

Abolghasem Karimi Feizabadi; Ali Akbar Estaji; Mohammad Zarghani

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5. On descent for coalgebras and type transformations

Pages 103-130

Maurice Kianpi

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6. Properties of products for flatness in the category of $S$-posets

Pages 131-152

Roghaieh Khosravi; Mojtaba Sedaghatjoo

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7. Realization of locally extended affine Lie algebras of type $A_1$

Pages 153-162

Gholamreza Behboodi

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8. Abstracts in Persian, Vol. 5, No. 1

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• Editorial
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