Fána

Sa mhatamaitic, is uimhir í fána nó grádán de líne a chuireann síos ar threo agus ar ghéire na líne.[1] Is minic a chuirtear fána in iúl leis an litir m ; níl aon fhreagra soiléir ar an gceist cén fáth a n-úsáidtear an litir m le haghaidh fána, ach tá a húsáid is luaithe sa Bhéarla le feiceáil in O'Brien (1844) a scríobh an chothromóid na dronlíne líne mar "y = mx + b" agus tá sé le fáil freisin in Todhunter (1888) a scríobh é mar " y = mx + c ".[2]

Fána:

m={\frac {\Delta y}{\Delta x}}=\tan(\theta )

Tagairtí

Clapham, C.; Nicholson, J. (2009). "Oxford Concise Dictionary of Mathematics, Gradient" (PDF). Addison-Wesley. p. 348
O'Brien, M. (1844), A Treatise on Plane Co-Ordinate Geometry or the Application of the Method of Co-Ordinates in the Solution of Problems in Plane Geometry, Cambridge, England: Deightons

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[1] Clapham, C.; Nicholson, J. (2009). "Oxford Concise Dictionary of Mathematics, Gradient" (PDF). Addison-Wesley. p. 348

[2] O'Brien, M. (1844), A Treatise on Plane Co-Ordinate Geometry or the Application of the Method of Co-Ordinates in the Solution of Problems in Plane Geometry, Cambridge, England: Deightons