It is important to distinguish the difficulty of describing and learning a piece of notation from the difficulty of mastering its implications. [...] Indeed, the very suggestiveness of a notation may make it seem harder to learn because of the many properties it suggests for exploration.
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§5.2Kenneth E. Iverson
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The difficulty, as in all this work, is to find a notation which is both concise and intelligible to at least two people of whom one may be the author.
Paul Taunton Matthews
The properties of executability and universality associated with programming languages can be combined, in a single language, with the well-known properties of mathematical notation which make it such an effective tool of thought.
Kenneth E. Iverson
With the computer and programming languages, mathematics has newly-acquired tools, and its notation should be reviewed in the light of them. The computer may, in effect, be used as a patient, precise, and knowledgeable "native speaker" of mathematical notation.
Kenneth E. Iverson
The Dirac notation, though originally applied to the propagation of single particles, also applies to describing the propagation of ensembles of coherent, or indistinguishable, photons.
F. J. Duarte
I am going on very well with my pictures... the park (Wivenhoe Park) is the most forward — the great difficulty has been to get so much in as they wanted to make them acquainted with the scene — on my left is a grotto with some elms — at the head of a piece of water — in the centre is the house over a beautifull wood and very far to the right is a Deer House — what it was necessary to add. So that my view comprehended to many degrees — but to day I got over the difficulty and I begin to like it 'myself'... I live in the park and mrs Rebow says I am very unsociable.
John Constable
Iverson, Kenneth E.
Ives, Charles
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