This work presents a simple integer-only instruction set architecture and microarchitecture derived from One Instruction Set Computers (OISCs) embedding multiple execution modes ( mOISC), capable of running at reasonable performance level to enable basic usability in microcontroller applications. The purpose mOISC is data transfer tasks run small programs while maintaining ultimate simplicity. ...

We give a complete and self-contained proof of folklore theorem which says that in an Alexandrov space the distance between point γ(t) on geodesic γ compact set K is right-differentiable function t. Moreover, value this right-derivative given by negative cosine minimal angle any shortest path to (Theorem 4.3). Our treatment serves as general introduction metric geometry relies only basic elemen...