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Which postulate is used to answer?
Could you please specify which postulate you are referring to?
Can a postulate be used to justify the steps of a proof?
no
An undefined term cannot be used to state a postulate?
falce
Can postulates be used to solve theorems?
No. A postulate need not be true.
Does a postulate need to be proved?
yes no. ( a second opinion) A postulate is assumed without proof. Postulate is a word used mostly in geometry. At one time, I think people believed that postulates were self-evident . In other systems, statements that are assumed without proof are called axioms. Although postulates are assumed when you make mathematical proofs, if you doing applied math. That is, you are trying to prove theorems about real-world systems, then you have to have strong evidence that your postulates are true in the system to which you plan to apply your theorems. You could then say that your postulates must be "proved" but this is a different sense of the word than is used in mathematical proving.
