TOL systems and languages

TOL Schemes and Control Sets

Suppose given two of the following: a set L1 of start words, a set L~ of target words, and a control set ~ of finite sequences of applications of a given finite set of homomorphisms (or finite substitutions) which map L 1 into L2 • Using notions from OL systems, the present paper investigates what can be said about the remaining set in case the given sets are regular. When the start and target ...

Deep VLT spectroscopy of the blue compact dwarf galaxies Tol 1214 – 277 and Tol 65 ⋆

We present VLT spectroscopic observations with different spectral resolutions and different slit orientations of the two metal-deficient blue compact dwarf (BCD) galaxies Tol 1214–277 and Tol 65. The oxygen abundances in the brightest H ii regions of Tol 1214–277 and Tol 65 are found to be 12 + log O/H = 7.55 ± 0.01 and 7.54 ± 0.01, or Z⊙/24 . The nitrogen-to-oxygen abundance ratios in the two ...

Richard S.J. Tol

For a long time, it was politically incorrect to speak about adaptation to climate change, because it presumably implies accepting defeat in the battle against evil emissions (Burton, 1994). This has changed, perhaps because scientists repeatedly pointed out that climate change cannot be altogether avoided even if we try very hard (Parry et al., 1998; Wigley, 1997), and perhaps because George W...

Systems Need Languages Need Systems!

Domain-specific language and compiler extensions can significantly reduce the complexity of systems, especially when written in C or C++. However, instead of the current variety of ad-hoc implementation strategies, which include preprocessor macros, C++ templates, and custom-built language processors, system builders need a uniform and general facility for realizing their own extensions. In thi...

Metacognitive (Rending) Strategies Across Languages and Techniques