Semi-affine structures on groups and semi-braces

We introduce semi-affine structures on groups and show they form a category equivalent to that of semi-braces. In particular, such a new description of semi-braces includes that presented by Rump for braces. By specific semi-affine structures, we provide several instances of bi-skew braces, including some that are not lambda- homomorphic. Finally, we give a method for determining semi-affine structures on the Zappa product of two groups both endowed with semi-affine structures and prove that such a construction allows for obtaining semi-braces that are not matched product of semi-braces.