  The truths of science are expressed in the form of propositions.  “Propositions may assert an identity of time, space, manner, quantity, degree, or any other circumstance in which things may agree or differ” (Jevons 1874: 36). Simple propositions A = B express the most elementary judgment regarding identity. The use of the mathematical symbol ‘=’ implies that the distinction between subject and predicate vanishes, which makes quantification of the predicate possible. Several logicians opted for what Jevons calls the “indeterminate adjective” ‘some’, represented symbolically by ‘V’. Jevons rejects the usage of indeterminate symbols and suggests that A = VB (All As are some Bs) should be written as A = AB.  Propositions of this kind express an identity between a part of B and the whole of A.