@staticmethod
def delete(key):
    state_props = bpy.context.window_manager.MathVisStatePropList
    index = state_props.find(key)
    if (index != (- 1)):
        state_props.remove(index)
@staticmethod
def delete(key):
    state_props = bpy.context.window_manager.MathVisStatePropList
    index = state_props.find(key)
    if (index != (- 1)):
        state_props.remove(index)