The titles LEMMA, THEOREM, PROOF, COROLLARY, REMARK, DEFINITION etc. should be leftjustified and numbered consecutively with arabic numerals, e.g. LEMMA 1. The content of the lemma, theorem etc. should follow, as here. Manuscripts should be typed, on high quality A4 or quarto bond paper, one side only with at least double spacing, and with a margin of at least 4cm all around. If the title is long, supply also a shortened form of the title not exceeding 40 characters, including spaces.