# Logic1007 - The tableau method : 1. 2. 3. Two types of...

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Midterm Monday 19th 9pm HW #5 1. 11.1(j) on p.90 2. 11.3(b) on p.94 3. For synthetic tableaux, show: if X=>Y and ~X=>Y are provable, so is Y.
HW #3, Q1 kp & (g=>a): prosecutor is a knight iff guilty => accomplice kd & ~kp: defense attorney is a knight iff ~ kp.

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Reducing eight rules to two Will be helpful later in Part IV Formulas with direct consequences (both/and cases) are called α-formulas, or of conjunctive type or type A . Formulas that branch (either/or cases) are called β-formulas, or of disjunctive type or type B . T~X, F~X count as both types.
T~X F~X TX Y FX Y FX TX TX TY FX FY TXvY FXvY TX = Y FX = Y FX TX TX TYFY FX TY FY Rule A α Rule B β

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Conjugation The conjugate of TX is FX, and vice versa. The conjugate of any α is some β, and vice versa. In that case, the conjugate of α1 is β1 and the conjugate of α2 is β2. T~X
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## This note was uploaded on 02/04/2010 for the course HSS Hss105 taught by Professor Yeelee during the Fall '09 term at Korea Advanced Institute of Science and Technology.

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Logic1007 - The tableau method : 1. 2. 3. Two types of...

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