Disjunctive Syllogism - Proof

Proof

Proposition Derivation
Given
Given
Material implication
Modus ponens
Proposition Derivation
Given
Given
Material implication
Transposition
Modus ponens

Read more about this topic:  Disjunctive Syllogism

Famous quotes containing the word proof:

    “Ah! I have penetrated to those meadows on the morning of many a first spring day, jumping from hummock to hummock, from willow root to willow root, when the wild river valley and the woods were bathed in so pure and bright a light as would have waked the dead, if they had been slumbering in their graves, as some suppose. There needs no stronger proof of immortality. All things must live in such a light. O Death, where was thy sting? O Grave, where was thy victory, then?”
    —Henry David Thoreau (1817–1862)

    “The chief contribution of Protestantism to human thought is its massive proof that God is a bore.”
    —H.L. (Henry Lewis)

    “War is a beastly business, it is true, but one proof we are human is our ability to learn, even from it, how better to exist.”
    —M.F.K. Fisher (1908–1992)