{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,19]],"date-time":"2025-06-19T04:42:03Z","timestamp":1750308123829,"version":"3.41.0"},"reference-count":28,"publisher":"Association for Computing Machinery (ACM)","issue":"3-4","license":[{"start":{"date-parts":[[1983,8,1]],"date-time":"1983-08-01T00:00:00Z","timestamp":428544000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.acm.org\/publications\/policies\/copyright_policy#Background"}],"content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":["SIGSAM Bull."],"published-print":{"date-parts":[[1983,8]]},"abstract":"<jats:p>The supply of computer programs for algebraic calculation seems at present sufficient to satisfy the needs of any potential user (1). It would thus seem natural for a future user to ask for a copy of one of the existing programs. However, it turns out to be quite difficult in practice. Some algebraic systems are not distributed at all (MACSYMA (2) was until recently an example). Some others (e.g. SHEEP (3, 4)) exist only for definite types of computers, and adapting such a program to another computer is, for an inexperienced programmer, a task comparable in difficulty to writing a program from scratch. Several specialized programs will not be suited to the particular application intended. Finally, establishing a local group of experts in algebraic programming in a place where this activity was not represented before is an obvious (*) convenience for the users. Therefore we decided in 1977 to write our own program.<\/jats:p>","DOI":"10.1145\/1089338.1089339","type":"journal-article","created":{"date-parts":[[2007,1,17]],"date-time":"2007-01-17T18:32:02Z","timestamp":1169058722000},"page":"12-18","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["ORTOCARTAN"],"prefix":"10.1145","volume":"17","author":[{"given":"Andrzej","family":"Krasi\u0144ski","sequence":"first","affiliation":[{"name":"N. Copernicus Astronomical Center, Bartycka Warszawa, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[1983,8]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1070\/PU1980v023n01ABEH004898"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0010-4655(76)90012-6"},{"key":"e_1_2_1_3_1","unstructured":"I. Frick The computer algebra system SHEEP what it can and cannot do in general relativity. University of Stockholm report 77--14 (1977).  I. Frick The computer algebra system SHEEP what it can and cannot do in general relativity. University of Stockholm report 77--14 (1977)."},{"key":"e_1_2_1_4_1","unstructured":"I. Frick SHEEP user's guide. University of Stockholm report 77--15 (1977).  I. Frick SHEEP user's guide. University of Stockholm report 77--15 (1977)."},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00766299"},{"key":"e_1_2_1_6_1","first-page":"433","volume-title":"10th International Conference on General Relativity and Gravitation","author":"Krasi\u0144ski A.","year":"1983"},{"key":"e_1_2_1_7_1","unstructured":"A. Krasi\u0144ski and M. Perkowski The system ORTOCARTAN - user's manual. Report of the N. Copernicus Astronomical Center (1980).  A. Krasi\u0144ski and M. Perkowski The system ORTOCARTAN - user's manual. Report of the N. Copernicus Astronomical Center (1980)."},{"key":"e_1_2_1_8_1","unstructured":"A. Krasi\u0144ski M. Perkowski and Z. Otwinowski The system ORTOCARTAN for analytic calculations detailed description. Report of the N. Copernicus Astronomical Center (1979).  A. Krasi\u0144ski M. Perkowski and Z. Otwinowski The system ORTOCARTAN for analytic calculations detailed description. Report of the N. Copernicus Astronomical Center (1979)."},{"key":"e_1_2_1_9_1","unstructured":"Cambridge LISP reference manual (distributed on tape by A. Norman Cambridge).  Cambridge LISP reference manual (distributed on tape by A. Norman Cambridge)."},{"key":"e_1_2_1_10_1","unstructured":"E. M. Greenawalt J. Slocum and R. A. Amsler U.T. LISP reference manual. University of Texas at Austin 1975 (distributed on tape).  E. M. Greenawalt J. Slocum and R. A. Amsler U.T. LISP reference manual. University of Texas at Austin 1975 (distributed on tape)."},{"key":"e_1_2_1_11_1","unstructured":"J. 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Ng","author":"Genesereth M.","year":"1979"},{"key":"e_1_2_1_16_1","unstructured":"J. Smit page 74 in Ref. 15.  J. Smit page 74 in Ref. 15."},{"key":"e_1_2_1_17_1","unstructured":"M. Corona private communication.  M. Corona private communication."},{"key":"e_1_2_1_18_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00756363"},{"key":"e_1_2_1_19_1","unstructured":"A. Krasi\u0144ski page 290 in Ref. 6.  A. Krasi\u0144ski page 290 in Ref. 6."},{"key":"e_1_2_1_20_1","series-title":"Lecture Notes in Physics","volume-title":"Gauge theory and gravitation","author":"Baekler P.","year":"1983"},{"key":"e_1_2_1_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00768528"},{"key":"e_1_2_1_22_1","first-page":"21","volume":"269","author":"Bondi H.","year":"1962","journal-title":"Proc. Roy. 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