rigorously
31Supply and demand — For other uses, see Supply and demand (disambiguation). The price P of a product is determined by a balance between production at each price (supply S) and the desires of those with purchasing power at each price (demand D). The diagram shows a… …
32Thermometer — A clinical mercury in glass thermometer …
33Uncertainty principle — In quantum physics, the Heisenberg uncertainty principle states that locating a particle in a small region of space makes the momentum of the particle uncertain; and conversely, that measuring the momentum of a particle precisely makes the… …
34Collatz conjecture — Directed graph showing the orbits of small numbers under the Collatz map. The Collatz conjecture is equivalent to the statement that all paths eventually lead to 1 …
35Entailment — For other uses, see Entail (disambiguation). In logic, entailment is a relation between a set of sentences (e.g.,[1] meaningfully declarative sentences or truthbearers) and a sentence. Let Γ be a set of one or more sentences; let S1 be the… …
36Philosophy of mathematics — The philosophy of mathematics is the branch of philosophy that studies the philosophical assumptions, foundations, and implications of mathematics. The aim of the philosophy of mathematics is to provide an account of the nature and methodology of …
37Dialectic — The School of Athens, by Raphael. Dialectic (also dialectics and the dialectical method) is a method of argument for resolving disagreement that has been central to Indic and European philosophy since antiquity. The word dialectic originated in… …
38Logical implication — In logic and mathematics, logical implication is a logical relation that holds between a set T of formulae and a formula B when every model (or interpretation or valuation) of T is also a model of B . In symbols,# T models B, # T Rightarrow B # T …
39Scale-free network — A scale free network is a network whose degree distribution follows a power law, at least asymptotically. That is, the fraction P ( k ) of nodes in the network having k connections to other nodes goes for large values of k as P ( k ) k − γ where… …
40Forgiveness — doesn t mean that you deny the other person s responsibility for hurting you, and it doesn t minimize or justify the wrong. You can forgive the person without excusing the act. Depending on the degree and circumstance of the offense, (typically,… …
