Yet mathematical theorems are not verifiable by observation and experiment; they are known, in fact, by pure a priori reasoning alone.
(3) The model results are verifiable against observations.
The defining characteristic of a scientific model is that it can be used to deduce verifiable statements about observable aspects of nature, which makes it possible to test and refine a model using new data from subsequent observations.
And the first standard that must be met is that the trial, first of all, must be verifiable and open to international observation.
So in the second edition Ayer amended the principle to read: a statement is directly verifiable if it is either an observation statement or is such that an observation statement is derivable from it in conjunction with another observation statement (or observation statements), such derivability not being possible from the conjoined observation statement(s) alone.
However, when the results were reanalyzed, it was clear that the initial observations were reproducible, verifiable by different laboratories and valid [ 7].
In the pilot work, we found high levels (>90%) of test-retest reliability and agreement between informant response and direct observation on a number of verifiable factors.
That's not surprising, because observation is respectable, useful, intellectual, and verifiable.
The observation that cough frequency does not improve despite verifiable reductions in oesophageal acid exposure challenges the role of acid reflux in Idiopathic Pulmonary Fibrosis associated cough.
The other two tenets are that the identity and authenticity of scientific measurements be verifiable within a defined range of precision, and that measurements and observations not be confounded by extraneous factors known to corrupt their accuracy and precision (Borgert et al. 2011; Gori 2009a, 2009b).
