Biconditional introduction

Biconditional introduction is the inference that, if B follows from A, and A follows from B, then A if and only if B.

For example: if I'm breathing, then I'm alive; also, if I'm alive, then I'm breathing. Therefore, I'm breathing if and only if I'm alive.

Formally:

 ( A → B )
 ( B → A )  
 ∴ ( A ↔ B )


In the News

[Odd] A Romanian couple has named their son Yahoo as a sign of gratitu
Daily Libertatea said on Thursday Cornelia and Nonu Dragoman, both from Transylvania, met and decided they were meant for each other following a three-month relationship over the net.They married and had a baby this Christmas, whom they decided to name after one of the worldwide web's most popular portals."We named him Lucian Yahoo after my father and the net, the main beacon of my life,"Cornelia Dragoman was quoted as saying.

The Encyclopedia of Diderot &d'Alembert: Collaborative Translation Pro
"This site has been designed to make accessible to teachers, students, and other interested English-language readers translations of articles from the Encyclopédie edited by Denis Diderot and Jean le Rond d'Alembert in the 18th century."Articles are browsable (by translated title, original title, or subject) and searchable (with options for Boolean, proximity, and bibliography searches). Also provides original French articles. From the University of Michigan Library and the Digital Library Extension Service (DLXS).

Receptor Protein Appears To Be Key In Breakdown Of Kidney Filtration
Researchers have identified a new molecular pathway that appears to be involved in urinary protein loss, an early-stage kidney disease that affects 100 million people around the world, and is caused by a breakdown in the kidney's filtering structures. The pathway may be new target for cell-specific treatment of chronic kidney diseases.

Gadget Lab's Weekend News
NASA's moonbase plan tackles lunar cement and inflatable living quarters; Virgin America planes play Doom; Novell could be banned from selling Linux. In Gadget Lab.

Centers for Disease Control and Prevention: Breastfeeding
Federal government information related to the study and promotion of breastfeeding, including recommendations (such as handling and storage of human milk, and vitamin D supplementation), effects of specific diseases and conditions on breastfeeding, statistics, and policy. Also includes a FAQ and annotated links to additional resources. From the Centers for Disease Control and Prevention (CDC).

Making Waves: New Research Could Minimize Impact Of Future Tsunami
A team of experts is preparing to create tsunami in a controlled environment in order to study their effects on buildings and coastlines -- ultimately paving the way for the design of new structures better able to withstand their impact. Ahead of today's Coastal Structures 2007 International Conference, Dr. Tiziana Rossetto, UCL Department of Civil &Environmental Engineering, unveiled plans to develop an innovative new tsunami generator capable of creating scaled-down versions of the devastating waves.

Norwalk Virus: 'Cruise Ship'Illness Challenging And Costly To Hospital
A review of measures taken to address a 2004 outbreak of the highly infectious Norwalk virus at the Johns Hopkins Hospital has provided the first solid documentation of expenses and efforts in the United States to stop the infection from spreading among patients, staff and visitors. Total hospital costs for the three-month outbreak -- including extra cleaning supplies, staff sick leave, diagnostic tests, replacement staff, and salaries and lost revenue from closed beds -- were estimated at more than $650,000.

Melanoma Tumors Carry Enemy Within, Suggesting New Treatment Strategy
Researchers have discovered that bortezomib, a promising cancer drug, is able to strike a blow against melanoma tumor cells by revving up the action of a cancer-promoting gene. The results suggest a novel treatment strategy: push cancer cells into overdrive, so that they self-destruct. The laboratory-based findingsmay lead to ways to give bortezomib with reduced side effects.

[Odd] A Romanian couple has named their son Yahoo as a sign of gratitu
Daily Libertatea said on Thursday Cornelia and Nonu Dragoman, both from Transylvania, met and decided they were meant for each other following a three-month relationship over the net.They married and had a baby this Christmas, whom they decided to name after one of the worldwide web's most popular portals."We named him Lucian Yahoo after my father and the net, the main beacon of my life,"Cornelia Dragoman was quoted as saying.

Steve Jobs, Proud to Be Nonunion
Apple's CEO thinks teachers' unions ruined education. Maybe teaching can be outsourced to Chinese iPod factories where unions aren't a problem. Commentary by Leander Kahney.


MP3 Music Downloads

Preview songs, Download Free Music,Burn CDs at ITunes.com
iTunes_RGB_9mm

 


Google




InformationQuickFind.com - Find Information Fast

Links