Single-Particle Electrodynamics - Assassination Science

noted that the inline fraction symbol / has lower precedence than all multiplication
operations, so that abc/xyz is identical to (abc)/(xyz). However,
if more than one / appears in any product, without binding indicated, then
the expression is in error: the intended binding must be forced.
The addition and subtraction symbols: + and −. These symbols have
lower precedence than those listed above.
∑ ∏
The summation and product symbols: and . These symbols have
lower precedence than those listed above.
The Einstein summation convention: The presence of two indices with the
same standard symbol in a product of matrix factors implies a summation of
that factor with the index in question taking on all values of its enumeration
set. For three-vectors, the arbitrary position of either index is irrelevant; for
four-vectors, however, the convention only applies if one copy of the index is
covariant and the other is contravariant. If more than one copy of a standard
symbol appears as an index in an expression, and these copies do not satisfy
these rules, then no summation convention applies; no explicit note need
be made. The summation convention may also be suppressed by use of the
parenthesised words “(no sum)” at the end of any expression.
The evaluation symbol: | a=b . This symbol has lower precedence than all
those listed above. See equation (A.10) of Section A.3.10 .
The comparison operators: =, ≠, >,