On non-associative groupoids
On order and betweenness compatibility.
On some extrem properties of a class of simple groupoids.
On some properties of Brandt groupoids.
On the integration theorem for Lie groupoids
On the intersection graph of a commutative distributive groupoid
On the monoids of homomorphisms of semigroups with unity
On the Pexider equation.
On totally non-commutative convergence groupoids
One-element extensions of distributive groupoids
Ordered groupoids and étendues
-группоиды и -сети
Partial groupoids with some associativity conditions
Permutable groupoids
Permutation group extension of groupoids.
Plongement d'un groupoïde médian dans le groupoïde multiplicatif d'un semi-anneau médian
Pointwise and global sums and negatives of translation relations.
Polynomials in idempotent commutative groupoids [Book]
Principal bundles, groupoids, and connections
We clarify in which precise sense the theory of principal bundles and the theory of groupoids are equivalent; and how this equivalence of theories, in the differentiable case, reflects itself in the theory of connections. The method used is that of synthetic differential geometry.
Products of mode varieties and algebras of subalgebras