A historic figure is a famous person in history , such as Catherine the Great , Abraham Lincoln , Washington , or Napoleon .
A historical figure is a famous person in history , such as Catherine the Great , Abraham Lincoln , Washington , or Napoleon .

Are these two sentences paraphrases of each other?
yes

The conservative central forces can always be expressed as a negative gradient of a potential energy :
Conservative central forces can always be expressed as the potential gradient of negative energy .

Are these two sentences paraphrases of each other?
no

The game was published on 12 September 2008 in Europe and on September 22 in North America .
The game was released in Europe on September 12 , 2008 , and in North America on September 22 , 2008 .

Are these two sentences paraphrases of each other?
yes

Although its conjugatic acid is highly reactive , peroxynitrite is basic in stable solutions .
Although its conjugated acid is highly reactive , peroxynitrite in basic solutions is stable .

Are these two sentences paraphrases of each other?
no