First, calculate the form by 35S :
2.5^3^4 = ?
In RPN ;
3 [Enter] 4 [y^x] 2.5 [x<>Y] [y^x] ... returns 1.7106 E 32 (Fix 4)
calcs : 2.5^(3^4) = 2.5^81 = 1.7106 E 32
In ALG (EQN) ;
2.5^3^4 ... returns 59604.6448 (Fix 4)
calcs : (2.5^3)^4 = 2.5^(3*4) = 2.5^12 = 59604.6448
TI-83+ also returns 2.5^3^4 = (2.5^3)^4 = 2.5^12 = 59604.64478
but HP50g returns 2.5^3^4 = 2.5^(3^4) = 2.5^81 = 1.710569411446 E 32
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