No, theorems cannot be accepted until proven.
Yes, theorems - once they have been proved - are valid evidence.
The plural is theorems.
postulate theorems tell that the lines are parallel, but the converse if asking you to find if the lines are parallel.
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.
Some theorems on artificial selection was created in 1934.
M. Sh Birman has written: 'Quantitative analysis in Sobolev imbedding theorems and applications to spectral theory' -- subject(s): Embedding theorems, Numerical solutions, Partial Differential equations, Sobolev spaces, Spectral theory (Mathematics)
Nash Statesman was created in 1949.
Nash Ensemble was created in 1964.
Joel Nash was created in 1998.
Natalie Nash was created in 1998.
Nash Timbers was created in 2003.
Jodie Nash was created in 2001.
Jamie Nash was created in 2001.
Travis Nash was created in 1995.
Nash-Healey was created in 1951.
Nash Rambler was created in 1950.