A
philosophical concept, usually applied in terms of
logical proof.
A thing which is
necessarily true is required, by its nature, to be
absolutely and uncontroverably
true. Examples of this
concept include:
- Triangles cannot be circles (triangles are geometric figures with three sides and angles totalling 180 degrees, while circles have no angles and no sides)
- Liquids cannot simultaneously be gas (liquids are a specific state of matter which require a set energy level that depends on the substance, and gasses are another state of matter, usually of a higher energy level and greater molecular mobility than liquid)
Edit: It has been brought to my attention that number two could be argued, by using the phenomenon of the
fluid matter state, but I maintain that having another
state of matter that exists separately of the two named does not discredit the idea that they are distinct.