suppose, in my frame an event (1) takes place at A and after time t another event(2)occurred at a nearby place B.Both A and B are in my field of view, so i record the time interval in a single clock in my hand. this is t and it must be a proper time interval.

Now suppose a clock moves from A to B with a velocity L/t where L is the distance between A and B in my frame. This clock is moving with respect to me, so it runs slower, so the time interval noted in this clock will be t/gamma. however, this clock is moving wrt me, so it is the improper time interval.

conclusion: proper time int(t) greater than improper time int(t/gamma) ,which IS DEFINITELY WRONG .