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Bill Callahan (American football)

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Not to be confused with Bill Callihan. Bill Callahan Callahan in 2015 Washington Redskins Position: Offensive line coach Personal information Born: ( 1956-07-31 ) July 31, 1956 (age 62) Chicago, Illinois Career information College: Benedictine Career history As coach: Illinois (1980–1986) Assistant Northern Arizona (1987–1988) Offensive line coach Southern Illinois (1989) Offensive coordinator Wisconsin (1990–1994) Offensive line coach Philadelphia Eagles (1995–1997) Offensive line coach Oakland Raiders (1998–2001) Offensive coordinator Oakland Raiders (2002–2003) Head coach Nebraska (2004–2007) Head coach New York Jets (2008–2011) Assistant head coach & offensive line coach Dallas Cowboys (2012–2014) Offensive coordinator & offensive line coach Washington Redskins (2015–present) Offensive line coach Career highlights and awards AFC Championship (2002) Head coaching record Regular season: NFL: 15–17 (.46...

2003 Alamo Bowl

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This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations . Please help to improve this article by introducing more precise citations. ( April 2014 ) (Learn how and when to remove this template message) 2003 MasterCard Alamo Bowl Michigan State Spartans Nebraska Cornhuskers (8–4) (9–3) Big Ten Big 12 3 17 Head coach:  John L. Smith Head coach:  Bo Pelini AP Coaches BCS 22 21 20 1 2 3 4 Total Michigan State 3 0 0 0 3 Nebraska 3 14 0 0 17 Date December 29, 2003 Season 2003 Stadium Alamodome Location San Antonio, Texas Referee Rich Kollen (Mtn. West) United States TV coverage Network ESPN Announcers Mike Tirico, Lee Corso, Kirk Herbstreit and Jerry Punch Alamo Bowl  < 2002   2004 >  The 2003 Alamo Bowl was an American football bowl game between the Michigan State Spartans and the Nebraska Cornhuskers played December 29, 2003 at the Alamodome i...

If turtles see everything, and nothing seen can see, does it follow that non-turtles exist?

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Clash Royale CLAN TAG #URR8PPP 8 Consider the following argument: Turtles see everything. Seeing is asymmetric (for the sake of argument). Therefore, something is not a turtle. I have problems symbolizing these statements. My attempt: Predicates: Tx: x is a turtle Sxy: x sees y Premises: 1) (∃xTx) Λ ∀x∀y(Tx → Sxy) 2) ∀x∀y (Sxy → ¬Syx) Using this set-up I cannot deduce the conclusion, which is ∃x¬Tx. I feel like my set-up is wrong. I think I should be able to complete the proof after correctly symbolizing the statements. Please let me know how to proceed. logic existence deduction share | improve this question edited Mar 2 at 7:26 Conifold 36.7k 2 57 146 asked Mar 2 at 6:29 Rob Rob 143 3 1 Isn't ths a take on Rissell's paradox? – Richard Mar 2 at 11:30 I think in the second premise, you're taking the converse instead of the contrap...