Transitivity p → q Proof by cases p → r (Hypothetical syllogism) q → r q → r ∴ p → r ∴ (p∨q) → r Resolution p∨q ∼p∨r ∴ (q ∨r) • Multiplexer (Selector) Logic Variable s is to select between variables p and q If s is true then be equal to p, otherwise (s is false) then be equal to q (s∧p)∨(∼s∧qThe heat output or 'BTU' (British Thermal Unit) calculator is a great way to work out how much radiator power you need There are several factors which can affect this, such as room dimensions, heating levels and types of window, which are all covered in our radiator BTU calculator Please note You may need several radiators for bigger roomsWaiting to be inspired? Electrical Service Manual Diy Manualzz XP{[ Öq r diy