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In principle, both are attributed to the direct product of real linear spaces, but the direct product of normed spaces is needed to deal with the calculus of\n                    <jats:italic>n<\/jats:italic>\n                    -dimensional spaces. We also prove that the Lebesgue measure on tuple-type sets introduced in [6] is\n                    <jats:italic>\u03c3<\/jats:italic>\n                    -finite.\n                  <\/jats:p>","DOI":"10.2478\/forma-2025-0010","type":"journal-article","created":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T05:00:21Z","timestamp":1767762021000},"page":"117-135","source":"Crossref","is-referenced-by-count":1,"title":["Measure for Product Space of Real Normed Spaces"],"prefix":"10.2478","volume":"33","author":[{"given":"Noboru","family":"Endou","sequence":"first","affiliation":[{"name":"National Institute of Technology , Gifu College 2236-2 Kamimakuwa, Motosu , Gifu , Japan"}]},{"given":"Yasunari","family":"Shidama","sequence":"additional","affiliation":[{"name":"Karuizawa Hotch 244-1 Nagano , Japan"}]}],"member":"374","published-online":{"date-parts":[[2025,12,31]]},"reference":[{"key":"2026033010152439291_j_forma-2025-0010_ref_001","unstructured":"Charalambos D. 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