1

∑=a=1×∞=1/∞=1=∞  

1/∞=1/1=1 infinitesimal, deceleration a or inverse +1 (standard model value "0" to negative)    

1=∞×(1/∞)=infinitesimal, deceleration a or inverse ∞ =1 infinitesimal, deceleration a or inverse 1=1=