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.
Stay in the heart of London. The Marylebone Hotel is within 550 yards from Bond Street Underground Station and the shops of Oxford Street including Selfridges, John Lewis and the designer boutiques of Bond Street. It offers complimentary access to a state-of-the-art gym, 20 yards swimming pool and fitness classes.