half multidimensional intervalhalf openhalf open intervalhalf plaidhalf planehalf rangehalf rotationhalf spacehalt statehalting problemhalvehalvedhalvingham sandwich theoremhamel basishamilton canonical equationhamilton canonical equationshamilton cayley theoremhamiltonianhamiltonian circuithamiltonian functionhamiltonian graphhamiltonian mechanicshandhand heldhand nuthand rammerhand reamehand shieldhand tapehandbookhandbuilt prototypehandinghandlehandprinthang uphanginghanging chainhankel functionhankel transformhappeninghard copyhard diskhard facinghard surfacinghardeninghardening temperatureharder to seehardnesshardware