1 (tiro)

1 (mid, kow) waa tirada ku xigta 0 oo ka horreysa 2. Waa tirada ugu horreysa ee tirooyinka dabiiciga ah (natural numbers), waana tiro sax ah (integer) oo togan. Astaanteeda caadiga ah ee tirooyinka Hindi-Carabiga waa "1".

Xisaabta, 1 waxay leedahay door gaar ah: waa cunsurka aqoonsiga ee isku-dhufashada (multiplicative identity), taas oo la micno ah in tiro kasta oo lagu dhufto 1 ay isku mid ahaanto (a × 1 = a). Sidoo kale, 1 waxay ku dhufan kartaa naftiisa mar walba isla natiijada (1ⁿ = 1).

Sifooyinka xisaabeed

1 lagama tirsho tirooyinka firaaqada ah (prime numbers), maxaa yeelay tiro firaaq ahi waxay u baahan tahay laba qeybiye oo kala duwan. Sidoo kale ma aha tiro isku-dhafan (composite). Sababtan awgeed, xeerka kala-jarista firaaqada (fundamental theorem of arithmetic) wuu adkaadaa haddii 1 firaaq loo tiriyo, waayo kala-jarintu ma noqoteen mid keli ah.

Xisaabta guud, cunsurka aqoonsiga ee isku-dhufashada waxaa lagu tilmaamaa "1" ama "e" xagga koox-yaqaanka (group theory). Matrix-yada, kaalintaas waxaa buuxiya matrix-ka aqoonsiga. Sidoo kale, 1 waa saldhigga qeexidda qaddarka (unit) ee cabbiraadda.

Astaamaha kale

Nidaamka Roomaanka waxaa loogu tilmaamaa I. Nidaamka binary-ga (laba-saldhig), 1 iyo 0 ayaa ah labada astaan ee kaliya, waxayna aasaas u yihiin xisaabinta kombuyuutarka. Macquulnimada (logic), 1 waxaa badanaa loo isticmaalaa qiimaha "run" (true).

Astaamaha la xiriira ee cinwaanka lagu soo xiray waxaa ka mid ah 0.1, iyo −1 oo ah tirada ka soo horjeedda ee 1 (additive inverse). 0.1 waa jajab tobanle oo ka yar 1.