What system does a dentist chair system use? pneumatic or hydraulic system?

Hydraulic system

Explanation

A system in which a vapor like air carries a force used in a confined area. liquid like a hydraulic system, a pneumatic system uses pressurized air to move amounts. The principal distinction is the mechanism utilized to transfer authority. In Hydraulics oil is utilized to carry control but in pneumatic condensed air is utilized to transfer authority.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.