The validity of an inference depends on the form of the inference. That is, the word valid does not refer to the truth of the premises or the conclusion, but rather to the form of the inference. An inference can be valid even if the parts are false, and can be invalid even if some parts are true.
LONDON -- President Barack Obama and wife Michelle Obama were welcomed to Buckingham Palace in grand royal style Tuesday by Queen Elizabeth II as they began their official state visit to Britain, a rare honor for a U.S. president.bama's mission, in part, is to reassure Britain and the rest of Europe that the traditional U.S. allies still have a central role in a U.S. foreign policy that has become increasingly focused on Asia and other emerging markets.
â¬ Click to expand/collapse the full text â¬ On Sunday, President Obama flew back to the United States on Air Force One. His wife, two daughters and her mother did a bit of shopping in Paris before taking their own Boeing 757 (C-32) over TO London to do some sight-seeing.he e-mail also questions the expenses for security for the family, saying that Michelle Obamaâs motorcade shut down [a] London street.. President Obama has himself been criticized for similar reasons â in one instance, for flying with his wife to New York City for a date to dinner and a Broadway show.