The phrase "are simply connected" is correct and usable in written English.
It is typically used in mathematical contexts, particularly in topology, to describe a space that is path-connected and has no holes.
Example: "In topology, we say that a space is simply connected if every loop can be continuously contracted to a point."
Alternatives: "are topologically simple" or "have no holes."
The steel slit panels are bolted to beams which are simply connected to the columns.
At present, a high proportion are simply connected to existing sewerage systems without regard to whether their addition could overwhelm existing sewage networks, and whether new systems could be needed.
His conjecture, made in 1904, was that in this four-dimensional world, all closed three-dimensional surfaces that are simply connected could be transformed to look like a three-dimensional sphere.
There is no effort to show any causal relationship between them its style is what rhetoricians call "paratactic" (typically, clauses are simply connected by "and") rather than "hypotactic" (when subordinate conjunctions such as "since" or "therefore" show some sort of relationship between clauses).
The wind turbines are simply connected to the central grid; they are not necessarily sited locally.
Since (Sigma _{0,0}) is homeomorphic to a disk, we conclude that (Sigma _+) and (Sigma _-) are simply connected.
Most travelers are not dawdling in Jamaica itself and are simply connecting to the E, J or Z subway lines or the Long Island Rail Road trains that can whisk them in 20 minutes to Manhattan.
Furthermore, if the manifold (M) is simply connected, then the space of bundle connection pairs can be classified by a collection of Lie algebra valued 1-forms on the manifold Ωm (called integrated lassos).
In this sense, the surface of the football is said to be "simply connected".
In this example, mathematicians would say that the surface of the apple is "simply connected".
So, this guy here is simply connected while -- -- this guy here is not simply connected because if I take this curve, that's a curve inside my region.
