The law of double negation is not valid intuitionistically. To show this with Heyting algebra semantics, let A=(0,1)∪(1,2). Then ¬A=(-∞,0)∪(2,∞), ¬¬A=(0,2), ¬¬A→A=(-∞,1)∪(1,∞) ne ℝ.

Long bone metastases (LBM) are a common occurrence in patients with advanced cancer, arising in up to 70% of patients with advanced disease.

Look at it this way: when a country like Norway, which has a foreign policy that is as fairminded and morally commendable as any other country, stubbornly refuses to obey the policies recommended by the international whaling regime, we can be pretty sure that the assumption of fairminded preferences does not hold universally.

Lastly, there were not a few scholars who, discarding the idea that myths were purely fictionary, and admitting a basis of reality, yet found that basis not in historical occurrence but in natural phenomena.