Yes, they can. This is done all the time in mathematics, logic and other areas. However, you must ensure that you either record the theorems used, or write them out in whole and attach them to the proof of the new theorem.
No. A postulate need not be true.
Axioms and logic (and previously proved theorems).
6 theorems
A smart antenna is used to identify signal signature and to track an antenna beam on the target. Some are for beamforming which is used to create the radiation pattern of the antenna.
I think Printed Antenna ( array microstrip antenna)
the theorems and postulates used in the proof
A car antenna booster is used to 'boost' the radio waves of the car's antenna. This is usually used to improve radio quality and reduce static that might be heard.
antenna can be used in both transmission and reception
it is used in space
Here are some examples of 10th-grade geometry theorems: https://quizlet.com/subject/geometry-10th-grade-theorems/
Some theorems on artificial selection was created in 1934.