You probably need to distinguish between "logic" symbols, and "math" symbols.
The "=" symbol is generally considered to be the mathematical symbol for 'equality'
The right handed arrow is generally considered to be the logic symbol for 'implies'
The double headed arrow (arrow pointing left and right ie '<->') is generally considered to be the logic symbol for 'equivalence'
To avoid mixing symbols from different fields I would say "=" is not the right symbol. Maybe the logic symbol '<->' is better.
To some extent I'm not sure what your trying to say is expressible in conventional symbols of logic or maths since these fields represent very 'black and white' concepts. There is no room for shades of grey. For instance I would image it is not a necessary condition for a person experiencing 'negative effect' to also suffer from SPI. So SPI does not imply negative effect it just that there is a tendency for a link to be established between the two.
Anyway what would I know, I'm an engineer. Ask me about beer.
2024 RRS on the road
2011 D4 3.0 in the drive way
1999 D2 V8, in heaven
1984 RRC, in hell
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