12 Jan 2003 17:59:29 -0500

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help understand Waite & Goos rmichalski@era.pl (Rafal Michalski) (2003-01-12) |

Re: help understand Waite & Goos juergen@informatik-vollmer.de (=?ISO-8859-15?Q?Dr=2E_J=FCrgen_Vollmer?=) (2003-01-21) |

From: | "Rafal Michalski" <rmichalski@era.pl> |

Newsgroups: | comp.compilers |

Date: | 12 Jan 2003 17:59:29 -0500 |

Organization: | TORMAN |

Keywords: | books, question |

Posted-Date: | 12 Jan 2003 17:59:29 EST |

Need some help to understand Waite and Goos "Compiler Construction"

formalism. Obviously these may be lamer's questions of computer

science - is there more suitable group? - but from mathematician's

point of view, things go unclear at EBNF introduction in 5.1.4.

First, it appears to me in Fig. 5.8

as if the set T was the sum of the following sets:

- set of identifiers

- set of literals

- {is, or, lpn, rpn, lbk, rbk, plus, star, period, separator}

instead of being sum of sets

- {identifier} (one-element set)

- {literal} (one-element set)

- {is, or, lpn, rpn, lbk, rbk, plus, star, period, separator}

?

Second, what is "set of unique identifiers", how it can be disjoint

from the set of identifiers an literals appearing in the

specification? Please help me see both sets L, I in Fig. 5.8c.

Greats

Rafal Michalski

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